Clean The shower booth is too small
What I liked best during my stay was Niedwald, and top floor (14, in fact 13, but after 12 they jumped to 14:)) with smoking rooms. The breakfeast also was very good.
Almost every things Nothing
there are lots of parks and woods around the hotel. its location is very poor in terms of local transport. nearest s-bahn station is kilometers away.
Shuttle to the fair easily gets full, and I sometimes needed to take a taxi.