Coming from Essen and Düsseldorf (Airport):

Drive on A40 in the direction of Dortmund. Leave A40 immediately after motorway interchange Dortmund West (A40/A45) and take the exit Dortmund-Dorstfeld. Now follow the map.

Coming from Kassel and Dortmund (Airport):

Drive on A44 through Dortmund (A44 changes to B1 in Dortmund and A40 behind Dortmund). Before reaching Dortmund West (A40/A45) you take the exit Dortmund-Dorstfeld. Now follow the map.