My girlfriend and I stayed in Joni & Carsten's beautiful basement apartment in mid-October and it was absolutely wonderful.
Joni and Carsten were great. Even though they lived in the same building (in a separate apartment upstairs) we were left completely alone but if we needed anything, we got a response back via the app within a few minutes.
The bed was one of the most comfortable I've ever been in, the shower was super powerful and hot and the outside area was a real bonus. The entire apartment was very, very clean and so spacious (the pics simply don't do it justice).
I did have slight reservations about the area before I came based on what I'd previously heard about Bed Stuy but it was lovely! Everyone was very friendly and the food options in the area are outstanding - lots of high quality independent bars and restaurants. You're close to the A/C too which takes you to Manhattan in around 30mins for even more options!
Overall, it was fantastic and I would highly recommend anyone to stay there.