Overall I had a good stay at Emma's apartment. Please note that this is a charming old walk up building and is not a new luxury rental. This is a great option if you are looking for a true "New York" experience and/or trying to save money on your travels.
Biggest pluses: excellent location, good natural light, and very comfortable bed.
Things to be aware of: the radiator, like all older NYC apartments, makes some noise in the winter. I used a white noise machine to block it out. Also, I shared this with the host while staying - a person staying in the airbnb next door was smoking and the smell got into the apartment on two occasions. The host was very quick to respond and the problem didn't persist. This is certainly not something the host can control, but just good information to know if you're sensitive to smoke like I am.
Again, overall a good stay to save money and have a pleasant New York experience in a really fantastic neighborhood.