The conference takes places at the Freie Universität Berlin in the building "Rostlaube", which is located in the south of Berlin.
The address is
Rostlaube der Freien Universität Berlin
Habelschwerdter Allee 45
Here you find a map of the all buidling of the Freie Universtität Berlin. The conference venue is located at E6 on the map.
A description how to get there can be found on the homepage of the Freie Universität (in German).