Future guests should be warned that this is a SMOKER'S house. I have no idea why no other reviewers (out of the 100+) mentioned this, but had I known I would've stayed elsewhere.
Don't get me wrong, Marc is no doubt a fantastic host and he helped me when I accidentally lost the keys, but it wasn't pleasant breathing in the strong second-hand smoke and having the stench in my clothes. It wasn't possible to keep it out due to large gaps in the room door, and ventilation was difficult.
Cleanliness was so-so and the walk to either train lines (there's the J Z, and the L line) was about 13 minutes. Not a massive distance but also further than would generally be expected in New York.
Also note that light sleepers will struggle with the bar music directly below especially on weekends.