The apartment was in an area with great restaurants and bars, decorated with great street art as well as thoughtless graffiti. The area of town is gritty and hip but manages to be less touristy, more laid back and livable than other parts of Berlin that we visited--like an unpasteurized Fort Green BK but safer and hipper. The apt itself is in a nice pre-war building with high ceilings on the 2nd floor. The place is spacious and sunny with a usable kitchen, and finicky front door lock as well as balcony door. The place is probably a little overpriced for the intended living space--it was clear we weren't supposed to use the bedroom. The living room that's set up as a bedroom was a little noisy but never really messed up our sleep. There's a good grocery store on the corner and our host left a lot of really great restaurant and bar recommendations nearby.
All in all, the experience was fantastic and I would consider staying at the same place again.