Hotels met sauna in Hamm

'Overall clean hotel, friendly staff, very relax wellness, good food, clean rooms(like in many parts of Germany ventilation is turned off during the night so if you take a late shower moist stays in the room). Shoes are off limits in the spa +swimming pool area but people use slippers(free of charge) to enter and they wear them already walking through the lobby going to the spa, thus taking up all dirt from others entering the lobby with shoes. I would urge the hotel to think about a solution...