Gerd is a very friendly person. We had a good time together when he welcomed us. His place is really nice and clean with a lot of light. We loved how it is decorated. The flat is next door to a bike shop and really close to the Subway (Tram Julius-Lerb-Brücke).
The only thing is that there is only one toilet and one bathroom and for six, that was ok for few days, but maybe not for a week.