We came to Germany for a football game and only stayed in the hotel for one night. However, from the moment I booked the hotel I have had a very pleasant experience. The communication via social media was excellent, very prompt. Due to my flight being very early in the morning and football game not on until late afternoon I was allowed to check in at 10am (standard time is 2pm) which was absolutely excellent. Staff was polite and helpful.
As we were only there for one night I can't really complain about room comfort, but I would have preferred firmer pillows and softer, bouncier mattress
Other than that, great hotel, great location (20min from dortmund and airport), very enjoyable stay!