My wife and i recently stayed at the Apple Tree for a weekend in DC. I had see the ratings on the Inn before booking it and was very happy to find that it was exactly what the raters said. The room was very nice, the bed excellent and the breakfast as cooked by the host were very good. The location was within walking distance of the Capitol and Air and Space Museum which we visited. It also was within walking distance of 3 or 4 small local restaurants, two of which we also visited in the evening. The hosts have more tourist information than you can ever review so you don't need to take any with you. They also had our parking pass which is required for parking on the streets in that area.
All in all, an excellent place to stay.