We, my wife and two kids, stayed for one month at Trang and John's apartment and were very very happy with our stay. They were really flexible and helpful to us and made sure we would feel at home, which we did.
The apartment was spacious, clean and had a nice atmosphere because of a lot of daylight coming in at the top floor. Very nicely preserved brownstone building.
The location of the house was great, next to Morningside Park, playgrounds, lots of places to eat and shop, and subway (with elevators) around the corner. The atmosphere on the street was relaxed and not what you might think of Harlem. The idea of the neighborhood being unsafe is outdated. At least for the part where the apartment is located.
I would surely come back here, when the opportunity calls for it.