after arriving at Graz-Hauptbahnhof (main station) you can either take one of the many taxis (taxi rank is located in front of the main station) or you can continue your way by using public transportation:
take tram number 6 and exit at station St. Peter-Schulzentrum (20 min.) - schedule
cross St. Peter-Hauptstraße at the pedestrian crossing and turn into Inffeldgasse
turn right after passing the Studienzentrum Informatik (Mensa)
Inffeldgasse 16b is now in front of you; turn left
after walking a few meters find our institute in the 3rd floor of the building Inffeldgasse 16.