Max's apartment is nice (much like how she is! :)). It's located about 6 blocks from the nearest subway station (86th and Lexington) making it easy to locate and go places from. UES neighborhood is a peaceful area. I did not have any safety concern during my stay. The unit is located on the 4th flr and you'd go up via stairs only (much like most other apts in Manhattan) so just take note in case you have heavy luggages. The apartment is spacious and has all basic amenities, plus some decors - she had a nice little Christmas tree up when I arrived :) There's also a separate bedroom so there's some privacy which is cool.
It has also been easy to communicate with Max. I arrived a bit earlier than the schedule we agreed, and she was able to accommodate to let me in as soon as possible.
It was overall a comfortable stay and I'd definitively consider booking Max's place again in future NYC trips!