Me and my family had a very nice time in Berlin. We didn´t meet Serge, but he´s friend was very kind and helpful with us. The location of this apartment was good. Only unpleasant thing was, that the host wrote three days before we arrived, that we have to cancel our reservation, because he didn´t noticed, that i reserved place for 5 people, not for 4 people. Fortunately we got a bigger apartment in the same house, but that meant extra money.