Janina and her husband are very kind hosts and perfectly easy to approach. We arrived very late around 2am and they still waited for us to let us in.
Unfortunately the room is really not as nice as it seems to be in the photos. It is not as bright and clean and not as well-equipped as one might think.
We had to throw toilet paper into a small bin after using it as the toilet apparently would have blocked otherwise. In general the bathroom did not seem entirely clean.
Airplanes fly very close to the appartment even during the night when landing at LaGuardia Airport which makes it hard to sleep tight. Besides the room gets very warm so that you either have to sleep with air conditioning or the door to the small balcony open.
The room might be a comparably priceworthy option to stay in New York, still you won't get what you might expect when booking the room.