I stayed for about a month while doing work in DC. I did love the attic...the private half bath makes any minor inconvenience irrelevant. There is a space heater that keeps the room warm. The attic can get a bit dusty so if you have allergies beware, but nothing too bad. The skylight is a plus and eliminates that dark atticy feel.
The way the house works is like a hostel. Someone comes and cleans the common area and you clean your room. Bathrooms were always clean! The house just has a common kitchen area and all other rooms are bedrooms that are rented out as well.
Mike was always quick to respond and make my stay better. He bought a wifi booster since the signal was weak in the attic. Also, since I stayed for so long, he gave me fresh sheets.
The area is mainly residential but there is a CVS right next door, a laundry mat within walking distance, barber shop (Kevin is great), and liquor store. Also, a cool lil persian restaurant (library tavern) that has hookah is close by. Metro station (Fort Totten) is about a 10-15 min walk.
Overall, I loved it and would come back if I'm ever in the area again.