I stayed at Dennis's place for 1 night and i enjoyed it. Clean comfortable bed with heater in the room, clean bathroom with all ameneties, big spacious living room, and a dining room with large dining table. All thing you need in a living place is abailable. The location if the place is not far from the national mall and you can ride the bus every 20 min to go there. Unfortunately i didn't have the chance to meet Dennis, but he contacted me and provided support.
I totally recommend Dennis's place.
Please note, Washington DC has 4 similar addresses that only differ in the location it is situated in. It have North East, Northwest, South East and South West, each is about 10-15 minutes apart by car. Be sure to memo the home address correctly to avoid getting lost.