Jan is very responsive. He provided detailed instructions how to reach his apartment. It was very easy to find it. The apartment is nice, clean and good located. It is only 20min from the ap. to the centre by walking (Checkpoint Charlie, Brandenburger Tor, ..) Only thing We were disappointed with , it was very cold in the apartment. We had full heating on but we were freezing. I recommemd you to take warm pyjama during winter season :)