Stayed in this hotel in a business-y district of Frankfurt. The room was large, but it does have the see-through shower - make sure you're not shy from your room-mate. My room was cold, the aircon was not working, it always annoys me when the hotel is for business, but you stilll have to crawl around on the floor and unplug something else to plug your laptop in. The Wifi was free, but good enough for skype, so no complaints there.
Breakfast was included in my room rate, it is rather spread out and not well handled. I wanted more coffee, but that seemed like it was far too difficult.
The U-Bahn is a short walk away to get into the Hauptbahnhof, so connections to everywhere were fairly easy.
This review is the subjective opinion of a TripAdvisor member and not of TripAdvisor LLC