From the central station you can take a cab (approx. 12 Euro).

As an alternative you can ride the tram. At the central station you can take the lines 16, 17, 18 or 19 to get to 'Neumarkt'. Now you change to the lines 7 or 8 and drive on 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.

From Deutzer Bahnhof you can take a cab (approx. 6 Euro). 

As an alternative you can 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.