Parking lot of Sportpark Kelsterbach, at the end of the Kirschenallee approx #60, where it meets Am Sportfeld.
Public transport (S-Bahn and walk approx. 1.2 km):
From Frankfurt get on S-Bahn S9 Frankfurt (Main) Hauptbahnhof towards Kelsterbach (direction Wiesbaden)
From Wiesbaden get on S-Bahn S9 Wiesbaden Hauptbahnhof to Kelsterbach (direction Hanau)
Get out of the train station to the north
Turn right into Frankfurter Straße and walk eastwards up to a rounadbout.
Turn left and immediately right into for Am Sportfeld
Walk down Am Sportfeld until you reach Kirschenallee.
There you will see a big parking lot and hopefully some hashers.
First of all, find your way onto B40, the connection between Frankfurt Airport and the A66 or B40 towards Frankfurt.
Either via A5 and B43 (from more east, north and south), A3 and B43 (west, north and south), A66, or out of town on B40 par B43.
Via B40, north and south:
Take the exit Kelsterbach.
At the first traffic light stay straight.
Leave the upcoming roundabout at the first exit
Turn directly right into Am Sportfeld.
Drive down until you meet Kirschenallee
Watch out for other parked Hashers to the left at the parking lot.
Take a look at the map maps.google.de