We had a great stay at Mathias' place! The location is wonderful, just a stone's throw from the old city centre, so you can walk everything if you want to. Although we did not talk to Mathias very often, because either we or he would be out, we did get the chance to talk for a bit. Mathias is a really nice guy, who will help you with anything if you ask for it. And if you love music, prepare for long talks and lots of youtube. Overall: we were very happy with the apartment, and would definitely recommend it.