I had a conference in DC (March 6-9) and stayed at this location. I had a great experience with these hosts. They were attentive, helpful and professional. It definitely made my trip stress free. Below are some specifics.

Location:
This place is close to DuPont Circle/Georgetown area. Great restaurants and bars. It is also a cheap cab ride away from the national mall.
Amenities:
This room has everything a hotel room has plus more! It has a great walk-in closet, a private bathroom, and a large *comfortable* bed. Good sofa and TV set-up as well. Most importantly its clean and you can tell the hosts spent sometime thinking about aesthetics and quality. Also, hosts are open to requests that you may have in terms of extra things you might need. (they provide clean linens and towels)

Logistics:
You get your own key to the main door property, so you can move in and out as you please. Tony was always a text/phone/email away, so it was very easy to communicate back and forth.

Overall, I felt comfortable and safe. I will definitely hope that this location is available on my next visit.