Guillaume was very welcoming and his place is super cozy! We loved staying there and had no problems. We had control of heat which was nice too. He gave us some indoor slippers to use and allowed us to use his washing machine and even cleared a space and turned the heat up so we could dry our clothes overnight. I have no complaints at all and wish we had stayed longer in Berlin! The UBahn is very close and there is a bus stop that is nearby as well.