We loved our stay at Greg's place in Washington DC. We felt safe in the neighborhood, and had many options to discover the city (short walks, buses, subways). We found very good restaurants nearby (brunch at Blue Duck Tavern, yummy!).
The studio is well equipped and comfortable, and Greg knows how to make your stay easy (very convenient check-in/out process, with the possibility to store our luggage, very much appreciated!), and he even came to say 'hi' when we arrived.
Moreover, Greg is very quick to answer if you have any question.
We definitely recommend his place!