We had a great time stayin over at Alan and Kasia's small Berlin apartment. The hosts were very responsive and they were there to let us in on time. Our host Alan gave us a lot of valuable advice on interesting places to go and things to see in Berlin and was helpful in helping out with practical questions too on the Berlin transport network etc. The only downside about the apartment is that it is located a bit off Berlin's center. However, with a tram that takes you directly to the eastern centre in 10 minutes and the S-bahn just around the corner this is not a major problem. For us it was an advantage since we traveled to Berlin by car and could park for free in the neighborhood. All in all, a recommendable place to stay for a few days in Berlin.