John is an excellent host - very communicative and flexible. The location is great and the apartment gives you an authentic experience of being in a Brooklyn prewar building (I used to live in similar apartments in the area up until I moved a couple years ago). While there are sleek newly-renovated apartments in the area that charge $600+ per night, it was nice to stay in a fairly-priced apartment that was well-maintained and had a lot of character and fun artwork.
I also appreciated the fact that he provided amenities that aren't so common in other AirBnB's like blackout curtains in the main room and good cooking equipment.
The checkout procedure was very easy - unlike so many other hosts, John doesn't demand that you clean the entire apartment (like seriously, why do these hosts get a way with charging a cleaning fee).
My back also enjoyed the memory foam mattress. The one thing to keep in mind is that the pillows are thicker and probably more suitable for back-sleepers. So if you're a side or belly sleeper you may want to bring your own pillow.
Overall, it was an enjoyable and reasonably-priced stay.