If you decide to stay in Matthias' apartment you will not regret it. The location is great, you have a metro station around 3 minutes of walk from the apartment, the room is really big and clean. Matthias is a great host (we arrived at 7 AM and he allowed us to leave our bags and gave us the key), he helped us greatly, he responds to any question in a matter of minutes. If we needed anything he helped us with it.