The apartment is too noisy. The windows do not have double glasses, so one hears all the noise from the 1st Avenue. It seems that Roman (or the company he represents) has various (or all the) apartments of the building. We stayed in #4D, so we did not have a view as someone commented before (this other airbnb client stayed at the 11th floor).
The heaters were also a problem. There are two electric heaters, one in each room. The thermostats were one in one room and the other in the living. As a result, the living room was cold and one of the room too warm. As they were electric heaters (not radiators), they were too noisy, and I woke up every time it turned on.
Summing the noise from the 1st Avenue and the one from the heaters, it was impossible to sleep without ears protectors (I have to buy them on my 2nd day at the apartment).
The location is good only if you are going to work at the UN (one block of the UN). It is possible to walk to Rockefeller Center, but it is a 15-20 minutes walk. The closest subway station stays at a 10-minute walk from the apartment. So, for tourism, location is no better than ok.