I stayed in the room in Irena's and her sister's apartment for five nights. It was exactly what I needed. It's exactly as described and shown in the pictures, a bedroom and private bath. Even though the room is very standard for a New York apartment, meaning not huge, it's very well organized and had ample options for me to unpack (shelves, hangers, hanging storage, hooks on the back of the door) and feel settled. It was also quiet. Because I was there in summer and had the air conditioner on, the hum of the unit made a nice white noise, but I feel confident that without the air conditioner it would still be quiet.
The location was also very good for what I wanted to do during my stay. I like to spend a lot of time walking in Manhattan. This building is about three blocks from the East River and about seven or eight blocks from Central Park just north of the Lenox Hill neighborhood in the southern part of the upper East side. I could easily walk also to midtown, MoMA, and The Met.