Niko was very forthcoming, both before and when we arrived. He very kindly accepted to host my niece who joined our trip shortly before we departed and went out of his way to accommodate her. Niko was friendly and patient, particularly with my son who asked him 10 000 questions. The flat/room is very small (NY standard!), but very well located and very quiet. Lots of restaurants/cafés etc all around, and easy access to everything. Everything was clean, the bed was too soft for me but my niece said she liked it that way (I prefer firmer beds) so that depends on your personal preference.
My only real "quirk" (which has more to do with AirBnB than the host) is that our original flight was cancelled so we got into the city 24 hours later than expected. This caused us to lose one of the two nights we had booked, and consequently almost 200$ thrown out the window, as such. This is obviously not Niko's fault, but I wish that there was some form or insurance or flexibility where we could get a partial refund in such circumstances. In the end we ended up spending almost 400$ for a total of 12 hours in NY which left me a little wobbly at the knees... Other than that, all was good and I would possibly consider staying there again during a future trip.