We had a great time staying at Heval's apartment. It is very spacious and modern with a very well-equipped kitchen. Having 3 bathrooms made a big difference when travelling in a big group like ours. The apartment is also easy to find and access by public transport. There is a big Aldi within a 5-min walking distance and a couple of restaurants.
Heval was a great host and made us feel welcome.
The apartment was very clean and would recommend it to any groups travelling to Berlin.