Last updated February 6 2026 at 10:34 AM
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Flats on First
Property highlights
Welcome to Flats on First, where boutique living meets luxury and comfort. Residents appreciate the modern design and top-tier appliances that make life here both stylish and convenient. Outstanding amenities like a state-of-the-art fitness center and serene landscaped courtyards offer a delightful retreat. Situated in East Cambridge, the property boasts a prime location with public transportation, cultural attractions, and numerous dining options just around the corner. Reviews highlight the safe and friendly neighborhood atmosphere, perfect for those who appreciate walkability and connectivity. Flats on First embraces both cats and dogs, making it an ideal choice for pet owners seeking an upscale urban experience.
- 13 units available
- Studio • 1 Bed • 2 Beds • 3+ Beds
- Location
- 21 Charles Street, Cambridge MA 02141, East Cambridge
- Amenities
- In unit laundry, Patio / balcony, Dishwasher, Pet friendly, 24hr maintenance, Garage + more
- Price range (total price, 12 month lease)
- $2,793 mo - $5,334 mo
- Commute
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Price and Availability
Flats on First apartments start at $2,793/month. There are 13 available apartments priced from $2,793 to $5,334. Prices were last verified by Flats on First (Total price includes base rent and required monthly fees—select a unit to view full breakdown.)
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Unit 316B
Avail. now
$2,793 moTotal price12-mo lease
Unit 423B
Avail. now
$2,852 moTotal price12-mo lease
Unit 217B
Avail. Mar 2
$2,890
$2,865 moTotal price15-mo lease
Unit 410B
Avail. Apr 16
$3,052 moTotal price13-mo lease
Unit 612B
Avail. Apr 12
$3,127 moTotal price13-mo lease
Unit 303B
Avail. now
$3,135 moTotal price12-mo lease
Unit 609B
Avail. now
$3,528 moTotal price12-mo lease
Unit 204B
Avail. now
$3,628 moTotal price12-mo lease
Unit 213B
Avail. now
$4,013
$4,287 moTotal price12-mo lease
Unit 615B
Avail. Apr 18
$4,553 moTotal price13-mo lease
Unit 407B
Avail. Mar 24
$4,569 moTotal price12-mo lease
Unit 207B
Avail. now
$4,569 moTotal price13-mo lease
Unit 514B
Avail. now
$5,334 moTotal price13-mo lease
There aren't any 3 bedrooms available. Turn on alerts to be notified once there are.
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Location
Amenities
- In Unit Laundry
- Patio / Balcony
- Dishwasher
- Pet Friendly
- 24hr Maintenance
- Garage
Unit Amenities
- In Unit Laundry
- Patio / Balcony
- Walk In Closets
- Stainless Steel
- Air Conditioning
- Dishwasher
- Bathtub
- Carpet
- Garbage Disposal
- Ice Maker
- Microwave
- Oven
- Range
- Refrigerator
- Smoke-Free Units
Property Amenities
- Pet Friendly
- Clubhouse
- Courtyard
- Fire Pit
- 24hr Gym
- Game Room
- Parking
- BBQ/Grill
- Bike Storage
- Garage
- Internet Access
- Media Room
- Package Receiving
- Cats Allowed
- Dogs Allowed
- Accessible
- Elevator
- 24hr Maintenance
- Business Center
- CC Payments
- Lobby
- Online Portal
- Smoke-Free Community
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.
Verified reviews
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Property Details
Must have 3x the rent in total household income (before taxes)
Explore the Area
- Brothers Marketplace0.4 mi
- Star Market0.5 mi
- Savenor's Butcher & Market0.6 mi
- Nourish Your Soul0.7 mi
- Whole Foods Market0.8 mi
- The Similans0.1 mi
- Helmand0.1 mi
- Boca Grande0.1 mi
- Toscanini's Ice Cream0.1 mi
- The Cheesecake Factory0.1 mi
- Cambridge St @ Third St0.3 mi
- Cambridge St @ Third St0.3 mi
- Lechmere0.3 mi
- Lechmere0.3 mi
- Lechmere0.3 mi
- 0.3 miCommunity Charter School of Cambridge — Charter, 6-12, 365 students, 0.3 miles away,GreatSchools rating 7 out of 10.
- 0.5 miKennedy-Longfellow School — Public, PK-5, 293 students, 0.5 miles away,GreatSchools rating 3 out of 10.
- 0.9 miFletcher/Maynard Academy — Public, PK-5, 296 students, 0.9 miles away,GreatSchools rating 5 out of 10.
- 1.0 miClarence R Edwards Middle School — Public, 6-8, 306 students, 1.0 miles away,GreatSchools rating 1 out of 10.
- 1.0 miCambridgeport — Public, PK-5, 342 students, 1.0 miles away,GreatSchools rating 5 out of 10.
- Data provided by GreatSchools. Ratings are based on test scores and additional metrics when available.
- Costa Lopez Park0.1 mi
- Charles Park0.1 mi
- Timothy J. Toomey, Jr. Park0.1 mi
- Front Park0.2 mi
- Cambridge Parkway0.2 mi
- Multicultural Arts Center0.2 mi
- Orangetheory Fitness0.2 mi
- The Foundry0.2 mi
- Skate @ Canal District Kendall0.3 mi
- Percy Howe Memorial Library0.3 mi
- Child Street Dog Park0.4 mi
- Charles Street Animal Clinic0.6 mi
- Unleashed0.9 mi
- Zero New Washington St Dog Park0.9 mi
- Fish & Bone1.2 mi
Getting Around
Walk & Transit Scores
Walk Score: 97 — Walker's Paradise, everything you need just steps away.Transit Score: 87 — Convenient public transit options nearby available.Public Transit Access
The East Cambridge area benefits from access to public transit options, such as 59 nearby routes: 48 bus, 11 rail, 0 otherNearby public transit stops include:
- Cambridge St @ Third St (~0.25 mi)
- Lechmere (~0.29 mi)
- Cambridge St @ Sciarappa St (~0.31 mi)
- O'Brien Hwy @ Museum of Science (~0.37 mi)
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Frequently Asked Questions (FAQs)
Flats on First has 13 units available starting at $2,793 per month (total price with fees when signing a 12 month lease). Check out the Price and Availability section for the most up-to-date unit information.
In Cambridge, MA, the average rent is $2,782+ for a studio, $3,322+ for a 1-bedroom, $4,126+ for a 2-bedroom, and $5,494+ for a 3-bedroom.* For more information on rental trends in Cambridge, MA, check out our monthly Cambridge, MA Rent Report.
*Based on base prices that don’t include fees
Some of Flats on First's amenities include in unit laundry, patio / balcony, and dishwasher. To see the other amenities this property offers, check out the Amenities section.
Flats on First is offering the following rent specials: Move in before 2/15 and receive 1 MONTH FREE, move in before 3/1 and receive 1/2 MONTH FREE! *Restrictions apply, please contact the leasing team for details.
Yes, Flats on First is pet-friendly.
Yes, Flats on First offers parking.
Yes, Flats on First offers units with in unit laundry.
No, Flats on First does not have a pool.
Yes, Flats on First has accessible units.
Yes, Flats on First has units with dishwashers.