Located at 21 Charles St, Unit 303C in Cambridge, MA, this modern one-bedroom, one-bathroom residence offers a thoughtfully designed open-concept layout with contemporary finishes throughout. Light wood-style flooring flows seamlessly across the living, dining, and kitchen areas, creating a cohesive and inviting atmosphere enhanced by recessed lighting. The kitchen is a standout feature, equipped with stainless steel appliances including a French door refrigerator, gas range, microwave, and dishwasher. Sleek gray cabinetry pairs with a mosaic tile backsplash and white quartz countertops, while a freestanding island provides additional prep and casual dining space. A gold-tone faucet adds a refined accent to the design. The open living area benefits from a large window that invites natural light and offers views of the surrounding neighborhood. The bedroom is generously proportioned, featuring an expansive floor-to-ceiling window that fills the room with sunlight and frames outdoor views. The bathroom is finished with clean white vertical subway tile in the tub-shower surround, complemented by brushed gold fixtures and hardware. A white vanity with an undermount sink completes the polished look. Additional conveniences include two closets, in-unit laundry, a hallway, and a dedicated entrance, making this a well-appointed and functional urban residence.
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Total Monthly Price
$3,086 - $6,629
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Bedrooms
Studio - 3 bd
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Bathrooms
1 - 2 ba
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Square Feet
439 - 1,303 sq ft
Flats on First embodies the best of boutique living, combining the luxuries of a modern apartment community with the comforts of a close-knit neighborhood. Come home to a place of sophistication and serenity in East Cambridge.
Highlights
- Walker's Paradise
- Premier Transit Location
- Bike-Friendly Area
- Walk-In Closets
- Deck
- Controlled Access
- Balcony
Pricing & Floor Plans
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Unit 617Bprice $3,086square feet 443availibility Now
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Unit 401Bprice $3,286square feet 591availibility Jul 27
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Unit 201Bprice $3,211square feet 584availibility Oct 10
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Unit 418Bprice $3,967square feet 767availibility Sep 18
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Unit 421Bprice $6,629square feet 1,303availibility Aug 19
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Unit 617Bprice $3,086square feet 443availibility Now
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Unit 401Bprice $3,286square feet 591availibility Jul 27
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Unit 201Bprice $3,211square feet 584availibility Oct 10
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Unit 418Bprice $3,967square feet 767availibility Sep 18
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Unit 421Bprice $6,629square feet 1,303availibility Aug 19
Fees and Policies
The fees listed below are community-provided and may exclude utilities or add-ons. All payments are made directly to the property and are non-refundable unless otherwise specified. Use the Cost Calculator to determine costs based on your needs.
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Utilities & Essentials
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Monthly Electric/Gas FeeYou may be required to obtain applicable utilities independently Charged per unit.Varies / mo
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Monthly Sewer FeeMonthly Water Fee Charged per unit.Varies / mo
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Monthly Water FeeMonthly Water Fee Charged per unit.Varies / mo
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One-Time Basics
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Due at Move-In
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Security DepositOr up to 1 month’s rent based on application screening results Charged per unit.$500
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DepositCharged per unit.$500
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Due at Move-In
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Dogs
100 lbs. Weight LimitRestrictions:NoneRead More Read LessComments
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Cats
100 lbs. Weight LimitRestrictions:Comments
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Other Pets
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Pet RentMax of 2. $60 per cat. $85 per dog. 2 pet maximum. Charged per pet.$60 - $85 / mo
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Personal Liability Renters InsuranceRecommended insurer if not submitting independent policy. Charged per unit.$18.75 / mo
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Automatic Renters Insurance (If coverage lapses)Personal liability renters insurance applied if previously obtained coverage lapses. Charged per unit.$15 / occurrence
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NSF FeeReturned check or rejected electronic payment fee Charged per unit.$50 / occurrence
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Month-to-Month FeeMonth-to-Month Fee Charged per unit.$700 / occurrence
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Key Fob ReplacementKey Fob Replacement Charged per unit.$5 - $50 / occurrence
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Move Out Fob FeeKey fob unreturned/lost at move-out. Charged per unit.$50 / occurrence
Property Fee Disclaimer: Based on community-supplied data and independent market research. Subject to change without notice. May exclude fees for mandatory or optional services and usage-based utilities.
Details
Property Information
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Built in 2021
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136 units/5 stories
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Energy Star Rated
Matterport 3D Tours
Select a unit to view pricing & availability
Matterport 3D Tour
About Flats on First
Flats on First embodies the best of boutique living, combining the luxuries of a modern apartment community with the comforts of a close-knit neighborhood. Come home to a place of sophistication and serenity in East Cambridge.
Flats on First is an apartment community located in Middlesex County and the 02141 ZIP Code. This area is served by the Cambridge School District attendance zone.
Unique Features
- Balconies*
- Bike Storage
- Butterflymx Intercom System
- Community Kitchen And Dining
- Controlled Access Parking Garage
- Co-Working Spaces
- Direct Access Entry*
- Full-Size, High Efficiency Washer/Dryer
- Game Room
- Gourmet Kitchens With Stainless Steel Appliances
- Grilling And Al Fresco Dining
- Groom Room
- Landscaped Courtyards With Outdoor Seating
- Luxury, Wood-Grained Vinyl Flooring
- Open Air Amphitheater
- Open Floor Plans
- Outdoor Lounges With Fire Pits
- Pet Friendly
- Roof Deck With City Views
- Schlage Smart Locks
- Social Spaces With Complimentary Wifi
- Stand-Up Showers*
- Walk-In Closets*
Community Amenities
Fitness Center
Controlled Access
Bicycle Storage
Package Service
- Package Service
- Controlled Access
- Lounge
- Fitness Center
- Bicycle Storage
- Gameroom
- Courtyard
Apartment Features
Walk-In Closets
Wi-Fi
Deck
Vinyl Flooring
- Wi-Fi
- Intercom
- Kitchen
- Quartz Countertops
- Vinyl Flooring
- Walk-In Closets
- Balcony
- Deck
Cambridge, situated along the Charles River, combines academic excellence with historic charm. As home to Harvard University and the Massachusetts Institute of Technology (MIT), the city maintains a strong intellectual presence while offering diverse neighborhood experiences. Harvard Square features historic architecture, independent bookstores, and local cafes, while Kendall Square has emerged as a global technology and research center. Outdoor enthusiasts appreciate the Charles River Esplanade and Fresh Pond Reservation, which provides 162 acres of walking trails around a glacial lake. The city offers various housing styles, from preserved Victorian buildings in Mid-Cambridge to contemporary apartments in East Cambridge, with concentrated residential areas near Harvard Square, Central Square, and Kendall Square.
The rental market in Cambridge reflects high demand, with current average rents at $3,297 for one-bedroom apartments (up 3.
Learn more about living in Cambridge- Package Service
- Controlled Access
- Lounge
- Courtyard
- Fitness Center
- Bicycle Storage
- Gameroom
- Balconies*
- Bike Storage
- Butterflymx Intercom System
- Community Kitchen And Dining
- Controlled Access Parking Garage
- Co-Working Spaces
- Direct Access Entry*
- Full-Size, High Efficiency Washer/Dryer
- Game Room
- Gourmet Kitchens With Stainless Steel Appliances
- Grilling And Al Fresco Dining
- Groom Room
- Landscaped Courtyards With Outdoor Seating
- Luxury, Wood-Grained Vinyl Flooring
- Open Air Amphitheater
- Open Floor Plans
- Outdoor Lounges With Fire Pits
- Pet Friendly
- Roof Deck With City Views
- Schlage Smart Locks
- Social Spaces With Complimentary Wifi
- Stand-Up Showers*
- Walk-In Closets*
- Wi-Fi
- Intercom
- Kitchen
- Quartz Countertops
- Vinyl Flooring
- Walk-In Closets
- Balcony
- Deck
| Monday | 10am - 6pm |
|---|---|
| Tuesday | 10am - 6pm |
| Wednesday | 10am - 6pm |
| Thursday | 10am - 6pm |
| Friday | 10am - 6pm |
| Saturday | 10am - 5pm |
| Sunday | Closed |
| Colleges & Universities | Distance | ||
|---|---|---|---|
| Colleges & Universities | Distance | ||
| Drive: | 3 min | 1.4 mi | |
| Drive: | 4 min | 1.6 mi | |
| Drive: | 4 min | 2.1 mi | |
| Drive: | 6 min | 2.1 mi |
The GreatSchools Rating helps parents compare schools within a state based on a variety of school quality indicators and provides a helpful picture of how effectively each school serves all of its students. Ratings are on a scale of 1 (below average) to 10 (above average) and can include test scores, college readiness, academic progress, advanced courses, equity, discipline and attendance data. We also advise parents to visit schools, consider other information on school performance and programs, and consider family needs as part of the school selection process.
View GreatSchools Rating Methodology
Data provided by GreatSchools.org © 2026. All rights reserved.
Transportation options available in Cambridge include Lechmere Station, located 0.3 mile from Flats on First. Flats on First is near General Edward Lawrence Logan International, located 4.3 miles or 9 minutes away.
| Transit / Subway | Distance | ||
|---|---|---|---|
| Transit / Subway | Distance | ||
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Walk: | 5 min | 0.3 mi |
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Walk: | 12 min | 0.6 mi |
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Walk: | 18 min | 0.9 mi |
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Drive: | 6 min | 2.4 mi |
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Drive: | 4 min | 2.4 mi |
| Commuter Rail | Distance | ||
|---|---|---|---|
| Commuter Rail | Distance | ||
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Drive: | 4 min | 1.2 mi |
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Drive: | 8 min | 2.3 mi |
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Drive: | 4 min | 2.5 mi |
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Drive: | 9 min | 3.3 mi |
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Drive: | 9 min | 4.4 mi |
| Airports | Distance | ||
|---|---|---|---|
| Airports | Distance | ||
|
General Edward Lawrence Logan International
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Drive: | 9 min | 4.3 mi |
Scores provided by
What do Walkability, Transit, Drivability, and Bikeability mean?
Walkability measures the walking distance to day-to-day needs.
Transit measures access to public transportation.
Drivability measures congestion, parking availability, and access to major roads.
Bikeability measures the suitability for cycling.
How It Works
Traffic
BusyAirport
CalmBusinesses
ActiveScores provided by
HowLoud What is a Sound Score Rating? A Sound Score Rating aggregates noise caused by vehicle traffic, airplane traffic and local sources. How It WorksTime and distance from Flats on First.
| Shopping Centers | Distance | ||
|---|---|---|---|
| Shopping Centers | Distance | ||
| Walk: | 4 min | 0.2 mi | |
| Walk: | 15 min | 0.8 mi | |
| Walk: | 18 min | 1.0 mi |
| Parks and Recreation | Distance | ||
|---|---|---|---|
| Parks and Recreation | Distance | ||
|
Museum of Science
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Walk: | 10 min | 0.5 mi |
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Boston African American National Historic Site
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Drive: | 5 min | 1.7 mi |
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Boston Public Garden
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Drive: | 6 min | 2.1 mi |
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New England Aquarium
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Drive: | 5 min | 2.1 mi |
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Boston National Historical Park
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Drive: | 5 min | 2.1 mi |
| Hospitals | Distance | ||
|---|---|---|---|
| Hospitals | Distance | ||
| Drive: | 3 min | 1.1 mi | |
| Drive: | 3 min | 1.2 mi | |
| Drive: | 3 min | 1.3 mi |
| Military Bases | Distance | ||
|---|---|---|---|
| Military Bases | Distance | ||
| Drive: | 28 min | 14.2 mi | |
| Drive: | 33 min | 18.0 mi | |
| Drive: | 30 min | 18.4 mi |
Flats on First Photos
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1BR, 1BA - 684SF
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Models
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Studio
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Studio
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Studio
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1 Bedroom
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1 Bedroom
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1 Bedroom
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Flats on First does not offer in-unit laundry or shared facilities. Please contact the property to learn about nearby laundry options.
Utilities are not included in rent. Residents should plan to set up and pay for all services separately.
Parking is available at Flats on First. Fees may apply depending on the type of parking offered. Contact this property for details.
Flats on First has studios to three-bedrooms with rent ranges from $3,086/mo. to $6,629/mo.
Yes, Flats on First welcomes pets. Breed restrictions, weight limits, and additional fees may apply. View this property's pet policy.
A good rule of thumb is to spend no more than 30% of your gross income on rent. Based on the lowest available rent of $3,086 for a studio, you would need to earn about $123,440 per year to qualify. Want to double-check your budget? Calculate how much rent you can afford with our Rent Affordability Calculator.
Flats on First is not currently offering any rent specials. Check back soon, as promotions change frequently.
Yes! Flats on First offers 5 Matterport 3D Tours. Explore different floor plans and see unit level details, all without leaving home.
21 Charles St
Cambridge, MA 02141