I just spent a week at Greg's place with my 13-year-old son and it worked out really well. The place is spotless, quiet, comfortable and well furnished. The bed was really comfortable and the air mattress worked out very well for my son. It’s not a camping one, so it’s actually really comfortable, high off the ground and easy to inflate (you just plug it in and turn the switch). We appreciated having a code on the door and not having to deal with (and avoid losing) a key or card. The location is excellent – close to Dupont and all it has to offer, while still quiet and residential. It’s a great spot from which to do all of the usual DC sightseeing, right near the Metro (along with bikeshare stations) and you can walk down to the Mall, to the zoo, Adams Morgan, Georgetown, etc. Greg was really responsive to all of our questions, which we appreciated. I recommend it and would definitely stay there again.