The hotel staff were very friendly, and the location near Dupont Circle was excellent. I'd give it 4.5 if I could.
I had a room facing the street, 2nd floor, and had no trouble sleeping with the window open. The rooms were of decent size - only thing I missed was a bathtub rather than just a gigantic shower. :)
Possible minuses for some:
Very expensive bar, as well as breakfast ($24, before tips).
No seating section in lobby.
You have to pay for wifi (or use the free wifi in the lobby).