First, Marija undersells her studio. It is listed as a room, but is a complete, small, studio. Kitchen, eating area, bathroom, bed/sitting area. There is a TV and some gaming consoles. It has a private entrance.
Second, as others have stated, there is city noise. The studio is in the heart of the city -- easy to get anywhere by cab or other public transit -- but there are people going by, and cabs honking, and other noises one would expect in the heart of NYC.
However, Marija has both a white noise machine and an air conditioner. It was still hot while I was there, so I kept the fan part of the A/C on at night and it canceled out all noise.
Marija herself was lovely. She was extremely helpful, from a mistake on my part during the registration process all the way through the check-in process.
I love visiting New York, and now I have the perfect place to stay!