This was a good place for us to stay for our week long trip to NYC. The neighbourhood was great to explore with the different eateries etc. To get into Manhattan, the closest subway was about 15-20 mins away so bear that in mind, especially at night. However we (as a couple) felt safe.
We were lucky enough to have a great person in the other private room for most of our stay, hardly heard them at all, let alone see them. However we shared it one night with someone else on our last night, and it wasn't a pleasant experience walking into a wet shower floor. So depending on who is in the other private room could make or break your stay.
Also the security of the place is also dependant on the other people staying at the airbnb, as you share a front door that you have to manually close when you leave and come back and the noise can travel too between levels and rooms. The doors to the private rooms don't have it's own locks either, so be mindful of that too.