You will find the Heinrich Heine University (HHU) and the University Hospital (UKD) in the south of Düsseldorf, only around 3.5 km from the centre of town and the main station.
The O.A.S.E. is located on the grounds of the UKD opposite the Rectorate of HHU. There are parking facilities nearby, both fee-based (e.g. P6) and free (e.g. P5 or Universitätsstraße).
The university campus is a small town within a town which is why it has many stops for buses and trams. "Universität Mensa" is the bus stop closest to the O.A.S.E.. We suggest using the Rheinbahn's timetable.