I just spent 5 nights at The Residence of Kalorama. I stayed there by myself while visiting DC for work. The location is great. It's walking distance from both Adams Morgan and Dupont Circle (and if you don't mind walking a few more blocks, from 14th Street), with all their coffee shops, restaurants and interesting little stores, including one of my favorite book stores -- Kramers). The place matches the description (and reviews) perfectly. It's super clean and very comfortable. I appreciated the bottle of wine and the coffee and snacks.
Highly recommended!