My sister and I came here for a concert at 9:30 Club, and we had such an enjoyable stay. We both said we slept great here! The street noise could hardly be heard inside the unit. There are neighbors upstairs, but their noise levels were minimal. The restaurants in this area are so great too.
The cork board with menus/ local recommendations was very nice! The metro is a short walk away if needed. They also provide cards for the metro, so you do not have to purchase one. If I come to visit Washington DC again, I think I will stay in Columbia Heights at Amit's place!