I stayed at Alper's place for eleven weeks.

The unit is comfortable and clean. It is more spacious inside than the pictures make it look. The kitchen doesn't have much prep area but is well-stocked and otherwise easy to cook in. In the hot and humid DC summer, it felt nice and cool inside all the time. The washer and dryer were really convenient and seemed pretty new.
VERY convenient location right across from the green/yellow line. The area is not the nicest, and it has typical city problems. If you're not used to living downtown it can be uncomfortable at night. The parking spot is in the driveway so you can access the unit without going out into the street. There's a Safeway, a few biergartens, and a lot of restaurants all within walking distance.
Alper is an 11/10 host. He was very responsive and accommodating, and any issues I had were immediately resolved. He is also just a generally nice and helpful person.
Overall, for the value it was a great place to spend a few months and I would definitely stay here again.