The nearest S-Bahn railway station from the Holi-Berlin is Lichtenberg. You can catch the S-Bahn lines S5 (Westkreuz - Strausberg Nord), S7 (Potsdam Hbf - Ahrensfelde) and S75 (Spandau - Wartenberg) as well as the U-Bahn line U5 (Alexanderplatz - Hönow) here. It is also possible to catch urban BVG busses and trams.
Further information Berlin S-Bahn BVG