Maricel's place is lovely. It's in a quiet, residential neighborhood, and a short walk to some really good restaurants (Le Diplomate, Estadio). The apartment's beautiful with a bunch of personal touches, and the little balcony's a big plus.
Maricel's an excellent host - extremely warm and responsive, and she gave us a ton of great recommendations for the weekend. We'd stay here again in a heartbeat the next time we're in DC.