IBIS KOELN CENTRUM. . Arriving by train: From Cologne main train station, take subway line U16 or U18 to Barbarossaplatz, which is just a stone's throw from the ibis Hotel Köln Centrum. If traveling by car, leave the A1 at the Klettenberg exit or the A4 at the Frechen exit, af ter which the route to the city center and Barbarossaplatz is signposted. If you are flying to Cologne, take S-Bahn line 13 to the main train station (Hauptbahnhof), then follow the route described above.