Arriving with the car you should exit at "Aachen Laurensberg",
turn to the right and follow the signs the Hospital ("Uniklinik").
After the tunnel take the 2nd exit. Turn left one street after
the first traffic light into Mies-van-der-Rohe Straße.
Behind the building on your left is the entrance to a big
parking lot where you can park for free.
Take a train via Heerlen to "Aachen West". Under the bridge
turn right and walk up to the Mies-van-der-Rohe Straße.
Walk up this street until the computer science centre ("Informatikzentrum")
is on your right. Enter the building and room 5052 will be just right across the hall.
Alternatively you can take the bus 33. In this case you arrive at the opposite side
of the centre and need to cross the whole building, though.