We were 14 guys for a Bachelor Party and had a wonderful stay! Werner allowed us to move in earlier and stay longer than usual! He provided us with all the necessary information and gave us tips for Berlin. He is a very nice guy.
The apartment is very well equipped, we did not miss anything!!!
Even though the location is a little bit far from the city center (which makes it legal by the way!!), you have a perfect train connection and you are everywhere in about 20 minutes!
We can highly recommend that place!!!