I had a really good stay at Cristophe's place. Me and a colleague went to a conference at the CityCube Berlin, which was at a walking distance. The place is in a really calm neighborhood, super cozy and clean for a good night sleep, but still close to a lot of public transport which takes you to the city in a few minutes. Cristophe knows a lot about the city and a lot else, we always had great conversations, but also very respectful of our privacy. 100% recommended!