Thanks for a nice stay! The apartment offers plenty of space and good facilities for relaxing after a day touristing Berlin.
The only thing that we might put a finger on is a bit unstable Wifi (it matters when bringing three kids between 11 and 18 😁) .
We used a rental car to make our way around in the city, and I think that was a practical solution for us, as a family. We noticed there was a good bus service at a quite short distance from the apartment, so I guess that would have worked as well.