We'll start on the north side of Marschallbrücke, next to the Elisabeth-Lüders-Haus, on Luisenstraße.
Reaching the starting point is easy: Take the S-Bahn to the Central Station and either go by foot along the Spree river until you reach the starting point or take U55 until Bundestag and pass between Paul-Löbe-Haus and Reichstag until you reach Marschallbrücke.
If you're travelling from southern direction, take the S-Bahn until Brandenburger Tor, change to U55 and exit at Bundestag. Then pass between Paul-Löbe-Haus and Reichstag until you reach Marschallbrücke.
Bus-stop Marschallbrücke of Bus line TXL is suspended during summer 2016. Otherwise it is the easiest way to reach the starting point as the bus stops directly in front of it.