From the A5 take exit Friedberg and keep right towards Rosbach.
Go right again on the second traffic light (before the Shell gas station).
Now you are on Raiffeisenstrasse.
Go straight ahead on this street, cross the intersection and keep going until you are almost at the end of the street where you will see a sign saying “Blaue Lagune” (Blue Lagoon).
Then go right once more and the second building on the left is Siemensstr. 12.