Frank is the man! Super friendly and fast communication. Internet went out on one of the days we were there and he let us know ASAP. We really appreciated all the amenities especially the bathroom set-up (bested a hotel). We requested two sets of keys (2 couples) and it wasn't a problem. He also let us stash our luggage in his kitchen (he's upstairs) after our check-out so we could explore without the extra baggage.
Like the other posts say, you do hear the train but we found that just fine. It's a rumble (kind of like a low roll of thunder) and not the screeching sounds.
I would definitely stay here again. It's cute, it's clean, and it's right next to a subway station that we used A LOT. Frank includes in his Airbnb post that if you're over 6'3 you may feel confined which is true as it is a basement apartment. The bedroom area where the sofa bed is has a dip in the ceiling where Fran has put in rubber-protector-things (think baby-proofing?) so the edges of the ceiling won't hurt as much if you run into it. I was very comfortable and didn't have to watch where I was going (5'2ft) but my boyfriend kept hitting his head on the ceiling while getting up from the sofa bed area (6ft). But other than that one area, he was fine and loved his stay.