8/10
A very short visit due do delayed flight but a great customer experience. For health reasons, I had asked for a room with as fresh air as possible. The friendly lady at reception next morning was very eager to know whether the room had fulfilled my expectations in that respect, and it had. She told me she had double-checked the room personally before my arrival and ventilated it very thoroughly to ensure my comfort. Had a nice breakfast and left Mannheim feeling good!