Pros: Super convenient to Frankfurt main train station, plenty of restaurants nearby. Friendly staff and great checkin/checkout times. Lobby etc are clean and modern, good elevator. Area is not considered the safest by locals but whatever. Bed was surprisingly comfortable. Two windows able to be opened, lots of natural light.
Cons: Room was honestly quite dirty. The carpet was filthy, saw many tiny ants in the room (bathroom, on the bureau, etc) and ant traps under the toilet. Overall condition was very, very worn. Perhaps I was just unlucky.
Fine for one night (train/airport connection).