By plane: Take a plane to Frankfurt Airport. Go to the Fernbahnhof Frankfurt-Flughafen and catch the next ICE train to Wuerzburg.
By train: Take a train to Wuerzburg Hauptbahnhof. Leave the train station and take either bus # 114 untill the final destination Universitaetszentrum Hubland or take bus # 14 (direction Gerbrunn) untill the bus stop Am Hubland or the bus stop Mathematisches Institut. Or take a taxi to the Universitaetszentrum Hubland.
You will then find us on the first floor of the so-called Verfuegungsgebaeude Physik II. This is the dark grey building located between the two buildings called ZSM and ZAE on the map below.