SiN III will take place at Erasmuslaan 9, room 01.26. It's situated opposite the University Library (UB) and the Erasmusbuilding (the highest one in town). To get there from Nijmegen central:

• Take bus 25 ("Heilig Landstichting") to the university library, or 11 ("Brakkenstein") to the Erasmusbuilding/Heyendaalseweg. (Bus 1 ("Molenhoek") takes a long detour but eventually stops at the Erasmusbuilding as well.)
• For completeness' sake, two more alternatives: take a bus to Tandheelkunde (near Radboud Ziekenhuis) and walk to the Erasmuslaan, or take the train to Station Nijmegen Heyendaal and walk along the Heyendaalseweg in the direction of the Erasmusbuilding.
• Here's a map of the campus, and of the campus situated in Nijmegen