We stayed two nights at David & Kathy's place. David & Kathy were fabulous hosts, providing easy arrival/departure, plenty of helpful information about sights to see, restaurants, bars etc, and they arranged a parking permit so we could park our car.
The apartment is cosy, with lovely furniture and a full kitchen - the bed exceptionally comfortable. The location is perfect; close to restaurants, bars, local shopping, bike hire, the White House and other attractions. Getting around Washington is very easy - you really don't need a car... We did all our sightseeing by bike, and as long as you check it in every 30 minutes it only costs $8/day... We also did a night sight seeing tour, which was just fabulous!
I can highly recommend a stay at David & Kathy's place.