From the airport Cologne/Bonn you can take a cab (approx. 25 Euro).

As an alternative you can take the suburban railway line 13 in direction to 'Köln' until the stop 'Köln Messe/Deutz'. From there you can either take a cab (approx. 6 Euro) or can continue by riding the tram. Take the tram line 1 in direction to 'Deutzer Freiheit' or walk there (approx. 4 minutes). At 'Deutzer Freiheit' you take the tram lines 7 or 8 in direction to 'Zündorf' and drive until the stop 'Drehbrücke'. From here you continue by walking on 'Siegburger Straße' in the same direction you were driving with the tram. After approx. 500 meters you get to a traffic light where the 'Kaltenbornweg' ends into 'Siegburger Straße'. Deutsche Card Services is located on the left hand side of the crossing.