Location, location, location! The apartment is situated perfectly for Lincoln Center, AMNH, Central Park, Riverside Park, MoMA, City Center, Carnegie Hall, and myriad eateries and shops. The apartment is homey and very much lived in, the polar opposite of a bland, empty hotel room. Lei is a superhost, responsive and accommodating.
The listing description is accurate, with the omission that the apartment lacks a microwave. Although isolated from street noise, the courtyard between the buildings on 75th and 76th street, which the apartment's outdoor terrace overlooks, can be noisy with children in the afternoon and social functions in the evening (but not after 9 pm during my 10-day stay). Sound is readily transmitted through the apartment's windows and walls. Someone in the building did morning (loudly creaking) stair exercises for 30 minutes between the 3rd and 4th floors that reverberated through the apartment. However, I found all such noise far less disruptive that sirens and traffic noise in accommodation facing a busy street.
The neighborhood and apartment were safe during my stay. However, both the outer and inner doors into the building were unlocked 24/7, which meant that anyone could walk into the building and confront the (non-security) door of the apartment. Having lived on the UWS for six years and had my apartment's security door breached by thieves while I was out-of-town, perhaps I have acute security awareness.
All in all, a wonderful NYC visit!