Y'all, Kristin's place is seriously awesome. I mean, it is a fifth floor walkup which the listing is quite clear about, but once you conquer those stairs (solid, wide and with handrails) it's a fantastic place. There's a huge two-story living room with a little curtained off corner for your privacy and adjacent kitchen and bathroom. During my stay she was generally either out of the building or back in a separate space, so I had all that space to myself. Totally quiet with no city or neighbor noise that I ever noticed. This is definitely for one person, with a single twin size bed that is good enough for a 6-foot-2-tall occupant or smaller. Air conditioning worked great during the NYC heat wave that my 4-day visit managed to coincide with.
I don't think the description mentions that a CitiBike station is right across the street, super useful for short hops around the village, especially on their new e-bikes, so bring your bike helmet if you have one. NYC has bike lanes everywhere but the roads can bumpy and drivers aggressive, so you really should wear a helmet. Two subway stations are about a 3-4 minute walk away, and 7th Ave right out the door is swarming with taxis. The immediate neighborhood has lots of meal and entertainment options -- check out Smalls jazz club a 6-7 minute walk away!