I stayed here with my two friends last week. Betty welcomed us in to the home and she was lovely. However, she told us that we had to pay €30 for arriving a bit later (9pm) even though she remained in the cafe until 11pm smoking inside. The smoking indoors was a bit of an annoyance as none of us smoke and the house and our clothes just smelt of cigarettes.
The decoration in the house is really nice but we found it all a bit unpractical I.e no doors for the bath/shower, no main room lights, not enough big towels for the 3 of us.
We were a bit surprised to hear that the kitchen was shared as I don’t remember seeing this on the listing but this wasn’t too much of an inconvenience to us.
We were out for most of the day so we didn’t find the cafe noise an issue but I can imagine that if you were indoors during the day it could be an annoyance.
Overall, I think in hindsight we may have chosen to stay elsewhere just due to the location but we still enjoyed our stay in Berlin.