What a great space! There was enough room for us to put our stuff without tripping over it, a bed with wonderfully soft sheets, a small but clean and efficient kitchen, and a bathroom that was better than most in that there was a well-lit shower (don't you hate showering in dark caves?), a sink with enough counter space to put your things, and even two shelves if you need more room to spread out. Communication was easy, and the location was perfect for us: close to transit, the Brooklyn Museum, Prospect Park, the Bagel Hole (yum), and Greenwood Cemetery.
We were especially impressed with how nice and quiet it was on the block. I think we heard one person honk their car horn outside, the whole time we were there. That's pretty great. I did see that someone complained in their review that they were woken earlier than they would have liked by Nick and his family's noise as they went about their morning routine upstairs. To that I would say: yes, there is noise from upstairs, but as in any flat in any city, it's highly likely you're going to hear the neighbors at some point. Bring silicone earplugs when you travel and I promise your sleep will be glorious.
All in all a great stay and we'd happily stay there again on our next trip.