From the A8 autobahn (Karlsruhe – Munich):
At the Stuttgart-Degerloch exit, take the B27 towards Tübingen; take the Filderstadt-Plattenhardt exit; take a right onto the Hohenheimer Strasse; at the traffic circle, take a left (3rd exit); turn right into the second street, Hofwiesenstrasse; then take the 2nd street to the right into the Heinrich-Hertz Strasse.
Here you can download and print the map & directions as a pdf file.
Or, simply follow directions available through the Google Maps route planner.