Betty is a friendly host and the apartment is beautiful. Very thoughtfully decorated and it perfectly represents the artistic side of Berlin which many people head to the city to enjoy.
Unfortunately the noise in the apartment is an issue. In the bedroom you are situated above the cafe kitchen and you might as well be in the same room. There is no sound insolation in there at all, so no privacy either.
In the lounge you have the same issue with the kitchen as the door separating the apartment to the kitchen doesn't fully close so there is nothing blocking out the sound (also not very safe as a small padlock shuts the room when you go out) but you also have music from the cafe which rules out relaxing in the room from about 11am-8pm.
Long story short - there is no sound proofing at all if you want peace and quiet and privacy then you won't find it here. I visited here on my honeymoon for what was meant to be 5 nights and tried to raise these issues with Betty but she wasn't willing to discuss the problems. We left after 1 night and had to book elsewhere at great expense.
The description for this apartment does mention noise, but the full extent of the noise was completely unexpected and unlike any experience I've ever had in a rented holiday apartment.
If noise is not a problem for you then this apartment will be great. Loads of character and charm, in a great area just not somewhere to relax unless it is early in the morning or past 8pm.