Mark was a fantastic host. And his apartment is amazing. Mark waited us till late evening because we stuck at passport control in JFK Airport for 2-3 hours. And when we were leaving, I asked Mark to postpone check-out for an hour and he was absolutely ok with that. Also Mark left us a notebook with lots of recommendations and other useful information. For example we visited Saraghina restaurant (in 2 minutes from apartment) which Mark advised and we had really good time there!
Apartment was very comfortable, clean and beautiful! With lots of antique details.
I wish my english could let me put into words all good impression of the our staying in NYC in Mark's apartment, but for now it's not so simple for me :) So, I'll say shortly: everything was perfect! I definitely recommend Mark as a host.