The workshop will take place at the Harnack Haus Berlin.
The closest international airports are Tegel (TXL) and Schönefeld (SXF). Taxis are available, although Berlin also has a very convenient and safe public transport network. The underground (U-Bahn) stop nearest to the Harnack Haus is called Freie Universität (Thielplatz) and served by the U3.
The Harnack Haus provides more detailed information of how to get there on their website.