Anja's place is pretty great. We were a little skeptical about the apartment because of some reviews from guests who had stayed before us, but we found the place tidy and comfortable. We reached out to the host multiple times for help or to replace stuff and she was super helpful every time. The apartment is in the heart of Kreuzberg so if you are young you will have plenty of places to have fun.
Added bonus: Yes you might hear the neighbor upstairs playing the piano, but we loved it. And it's not really loud, so if you don't mind a melody, you will enjoy it. Like we did.