Elizabeth's unit proved to be an excellent base for our recent 4-day trip to DC. It sits very close to Columbia Road, with several restaurants and shops we certainly enjoyed. A Metro (the local subway system) station is a short ride away on the Circulator bus system that runs down Columbia, or a 15 minute walk through a very pleasant tree-filled neighborhood. The National Mall, including the various Smithsonian museums, is about 2 miles away.
The apartment itself was clean and , if not large, certainly provided adequate space for my wife and me. Appliances worked well; we always try to rent units that have their own washer and dryer, and the set in the unit fit the bill. We ate dinner in the apartment one night (leftovers from the previous night's pasta dinner at the very enjoyable Al Volo, a few blocks down Columbia), and had plenty of dishes, pots, etc. The bed was comfortable.
The apartment is in the basement of what I understand to be the owners' family home. There was a little bit of noise from upstairs in the mornings, but it was not at all bothersome.
Overall, the apartment provided a comfortable, well-located home base for our DC visit. We would certainly recommend it for a couple.