Marjorie accepted us on somewhat short notice after another host had to cancel on us, she was a life saver. My friend and I were there for a concert and sightseeing so we spent very little time in the apartment. The guest room is at the front of the apartment with a hall door dividing it from the rest of the apartment. We saw very little of our host, had lots of privacy, didn't even hear her moving around when we were there, too bad we didn't have more time to hang around and get to know each other, she seems like the type of person that has loads of interesting stories.
The room is a decent size, bathroom and hallway are very narrow (didn't bother us any since we're both petite, but something to consider for a larger person). The door to the room is just an accordion style plastic door with a large gap at the bottom that the cat and one of the dogs easily fit under, but if you want to keep the pets out you just close the door to the hallway, no big deal. It didn't bother us to have them in the room with us now and then, they're all friendly and well behaved.
The best part of the apartment is the location! Other than the street noise at night (I recommend downloading a white noise app like Sleep Bug if you're a light sleeper) it's a great location. Walking distance to so many things. Lots of great restaurants and market nearby, short walk to Times Square, tons of theatres, Port Authority, a bit longer but doable walk to Empire State Building etc., very convenient area to stay in for sightseeing.

Other points to consider:
-wifi signal was excellent
-host provided bottled water and boxed wine in the room
-no kitchen use
-entrance is a bit cluttered, might be difficult to maneuver large suitcases
-one rather long set of stairs up to the apartment, no elevator, again might be difficult with large suitcases
-be sure to let host know exactly when you plan to check out! we had a little misunderstanding that wasn't handled well from her end but it's all good, we still had a great stay overall