We appreciated our stay at Alex's place, though we did'nt have the chance the chance to meet him since he was away. The room is big enough and the bed is comfortable. The environment is quiet. You can easily walk to the US Capitol or the White House, in 20-25 minutes. Alex is good at communication, and everything went smoothly to check in and out (the use of a PIN code to enter the house is very convenient).
On the other hand, we would have appreciated a bit more cleanliness (particularly in the bathroom/toilets). And Alex did not tell us prior our arrival that he had a roommate, so we were a bit surprised during the first night when we heard someone coming home...