If you are travelling with the car whatever direction you are coming from -- drive to the city center to Hauptbahnhof (central train station).
The Schillerstrasse is next to the south side of the central train station.

If you are travelling with underground or tube train travel to the station Hauptbahnhof and take the pedestrian exit Schillerstrasse.

If you are travelling with train upon arrival at Hauptbahnhof go to the main exit and on the right hand side you will find the Schillerstrasse.

Belle Blue is just 5 walking minutes away from tube underground and central trains from Hauptbahnhof.