We always stay in this hotel when arriving (mostly) late at Cologne-Bonn airport. The shuttle takes 2 minutes and if needed, you can walk to the Hotel in 10 minutes... S-Bahn to central train station Cologne from airport train station or regular trains to many other major towns in Germany.
Executive, non-smoking rooms on upper floors are spacious and modern. Uneven room numbers have 2 queen-sized beds while even room numbers have 1 king-size bed. Room numbers 602-620 are quiet and face forest, while higher room numbers (621-640) are closer to (noisy) airport entrance highway.