Dennis's space is perfectly located within easy walking distance of Georgetown University, or the Metro bus line. There is a grocery within a mile as well as quite a few places to eat like 7th Hill Pizza, or the famous Black Salt restaurant. You are within a comfortable walk (or a few minutes by car) of Georgetown's shopping and dining district.
The rooms are neat and well kept, as is the shared kitchen and bathroom. The facilities are utilitarian, but suffice any short stay in the area.
Dennis is prompt to respond and attentive to your needs. I'd recommend his place without hesitation to anyone.