We had a wonderful time in Berlin staying at Oliver's place. We felt at home from the moment we arrived - Oliver was very friendly and welcoming but also ensured we felt at ease and gave us space.
The flat is fantastic - super warm in the midst of winter and a lovely balcony. The lounge room was great to relax and listen to music. The apartment was more spacious than we had expected from the pictures. Our friends staying at an expensive hotel were a little jealous I think :)
Highly recommend!