Clean, comfortable, and well-located
I stayed at the Residence Inn Washington, D.C./Vermont Ave. on a recent work-related trip. The hotel was only three blocks from the McPherson Square Metrorail station, within easy walking distance of several Capital Bikeshare stations, and near lots of downtown eateries. 
When you walk in, the hotel looks really cramped on the ground floor, but if you go to the second floor the Hearth Room is very nice and is where the buffet breakfast is located.
I have stayed at a lot of Residence Inns and find the newer studio suites to be very spacious and attractive. However, I was first given a room on the top floor (floor 12), and the studio was incredibly small. I could hardly walk between the bed and the kitchen area. I called the front desk and asked if they had a bigger room and was then given a room on the 6th floor. Ever so much nicer and more spacious. Apparently, the higher up you go in this hotel, the smaller the rooms are. 
The desk staff was very helpful and friendly. Overall, this was a comfortable hotel and one that I would go back to.