We had a great time staying at Greg's for a conference. Greg's place is clean and looks exactly like the picture. We appreciated the small labels everywhere which lead us to find extra blankets and materials. We had an issue with the heating on the first night but Greg came quickly and resolved the issue. This is a prime location, close to the White House and the metro which we frequently took to travel.
We would definitely recommend staying at Greg's place if you are in D.C.