The property was easy to find (thru car navigation) and it's fairly close to Dortmund's Stadion Signal Iduna Park and Westfalenhallen, ca. 45min by foot, or there is U-Bahn (Underground Subway) is 1 min away from hotel, that takes you anywhere you like. The location is very quiet. We arrived on Saturday and there were no noise or people talking loud there. The staff there was very polite, with very good with English language (I was in many places in Germany but always struggled with my bad German language :) ) . The breakfast was typically German. It was good and freshly made. The view from windows was not so good, but I came there to sleep not to look out. The view is on the streets. The parking its outside on the streets.
Problem its with parking, that its on the streets outside. If you are lucky you get it. Its free to park. But I don't know how it's with that green stickers (I think that has something to do with ecology).
No other bad stuff we found.