Kassel has an extensive public transport system. The KVG (Kasseler Verkehrs Gesellschaft) operates 9 tram lines and 28 bus lines providing mobility and connections to the regional and national railway systems in and around Kassel.

You can get to the station University Campus ("Holländische Straße/ Universität") with Trams 1 & 5 and Bus 10. Further Information concerning the public transport: KVG Route Planner

Map of the station Kassel-Wilhelmshöhe (pdf file).
The map is in German language only, but quite easy to understand. The words "Bahnsteig" and "Bussteig" mean Train Platform and Bus Platform.