the hotel front staff were great, but the cleaning staff would cut corners (just flip dirty covers and not replace them). That surprised me... it’s been years since I’ve lived in Germany, but I remember quite vividly the attention to cleanliness.
The breakfasts were outstanding, and service staff were friendly. The beds were soft, when not on the hide-away.
the only other thing about the hotel, while it was convenient for the Hauptbahnhof, it wasn’t a good location in Frankfurt. but for a budget hotel, it was convenient.