I spent four nights at this home, and it was delightful. The room is easily large enough for two, wifi was excellent (important to me) and sharing a bathroom with another guest was no problem. The room and entire apartment was very clean and quiet. There were plenty of amenities (soap / towels). The host lives on site, and I like that, as it make communication easy and personal.
The location is a short walk (10-15 minutes) to Union station which is served by Amtrak, the DC Subway, and local bus service including the Circulator for the Mall, so getting around without a car is easy.
The host was helpful with ideas on how to use the transport system, and had some good thoughts on what to see as well.
Overall, I enjoyed my stay very much and wouldn't hesitate to recommend this room to anyone.