We stayed at Rosemary's place as we were working at the Kennedy Center. It was super convenient, a 5-10 minute walk. The apartment was very clean, the sofa and the bed were comfortable and the kitchen had all we needed for a short stay. However, it was a bit shabbier than expected from the photos, with some stains on the carpet and tippy lampshades. The ironing board was broken but thankfully the iron was working!
The flat was also somewhat dark, as there were heavy curtains (great for keeping out morning light) but hard to get lots of light in during the day. It was very convenient to a Whole Foods, Georgetown and a metro stop, and was right in the heart of George Washington U. It was also fairly quiet, for being in a city.