We stayed here for over three weeks with our 3 year old and our 1 year old. There were tons of books in several languages, plenty of toys to occupy kids on rainy days, and an amazing park right on the corner. This park (Burgerpark) was the perfect place to have picnics, see goats, or go to the skatepark, or children's zoo.
Alke was extremely responsive and helpful, and a lovely host.
The apartment is on a quiet side street, but very close to the tram, bus, and about a 10 minute walk to the S-bahn station. We did not have a car, but didn't feel like it was necessary.