My three kids (8+11+14) and I arrived too late due to train delay.
But David waited patiently and gave us a good introduction to the apartment and how to get around in Berlin from the apartment.
It's a nice flat where you are surrounded by David's paintings (my favorite is the pink woman).
And it's a ground-floor-flat which was really nice: the kids could go outside and play on the pavement. The nearby park is also recommended, it has minigolf and a small playground.
The neighborhood is nice, cheap supermarkets and small cafe's.
So cozy a place!