It was great to stay with Gary and his family. The room isn't super modern (the photos are representative) but it was tidy and quite spacious. Central airconditioning (in addition to AC in our room) helped to keep the room cool silently at night. Communication went smooth and we had a warm welcome. Their place is in a calm, residential neighbourhood. It's on walking distance from the free tram which runs quite regularly and brings you in the direction of the city centre. If you need to catch a flight do account for some extra time because some car owners ignore the law and station their vehicle on the tram tracks as they go into shops.
Only downside that we experienced that our first walk from tram to home felt a little less comfortable as we arrived quite late and weren't familiar with the people hanging around. But we did not feel unsafe doing so, and have done it many times during our stay.
We'd recommend walking to Union Market from Gary's place once to get a feel for the neighborhood and get a nice dinner there, and/or to walk down via Maryland Avenue Northeast to the Capitol.