The only thing that I could do its to recommend Carl as a host and his apartment. The place is really very well located, within a residential area, with access to the metro/tube and tram within a short walking distance. The neighbourhood is nice too. Cool restaurants and bars, and also a super nice organic Saturday market in case you fancy it. The apartment has everything you could need for a trip and we felt really comfortable whilst being there. After walking and doing sightseeing all day, getting back to Carl’s place, was like coming back home. Carl is also a great host. He made everything to make us feel comfortable and informed, before and during our stay, and he was also very kind to help us when we had a little issue during our stay. So, if you need a nice, well located apartment for your trip to Berlin, this is the place. Thanks Carl!