Walk down the stairs and turn right at the bottom. At the end of the underpass, take the stairs up to street level. Once you are outside, take a left, cross Prof.-Dr.-Helmert-Straße, and, staying on the right, walk in the direction of building no. 1. Walk up the flight of steps you see on the left, the entrance to building no. one should be directly in front of you. Once in the building, continue straight to room 3.04 to 3.06 on the top floor.