This apartment is very conveniently located right by 21st St / Court Sq subway station, in fact one of the lines is right outside the front door. That said, the room is at the back of the building which means you are shielded from the train noise to a point it is not an issue.
Although I didn't meet her in person, Nia was very accommodating with a late check in & responded to messages quickly. I have already requested a repeat stay here.