The pros:
The location is great, just down the block from the 86th Street subway stop and with some great places (including Milk Bar!) right nearby. The place is quite comfortable with speedy wifi and great water pressure. It's an historic building and the period detail is really lovely. Check-in was pretty easy.
The cons:
What others have mentioned about maintenance is true, though we also saw that the A/C unit in the bedroom was connected to the electrical outlet via two surge protectors, which is a fire hazard. It was tough to sleep in the living room with the loud radiator. We chose this place because it had an elevator (because I was traveling with my 70yo parents), but it's pretty rickety and not good if you have claustrophobia.
This place worked fine for this trip, but I probably wouldn't stay here again.