... by public transport

From Alexanderplatz:
Bus M48 (direction Zehlendorf, Busseallee) to bus stop "Kulturforum" or take the U2 to Potsdamer Platz

From Potsdamer Platz:
Bus M48 (direction Zehlendorf, Busseallee) from Varian-Fry-Str. to bus stop "Kulturforum"

From Kurfürstendamm (Adenauerplatz station):
Bus M29 (direction U Hermannplatz) to the stop "Gedenkstätte Dt. Widerstand".

Ab Gesundbrunnen:
direction "S2 S Blankenfelde Bhf " to S Anhalter Bahnhof then take bus M29 direction "Grunewald, Roseneck" to Gedenkstätte Dt. Widerstand

Additional information on public transport in Berlin can be obtained by following links:
www.bvg.de
https://www.vbb.de/