This is a great hotel. It is very close to the center of Frankfurt and very modern and well kept. And I don't mean modern as in "hip" and "spartan" but a hotel that feels very new, well thought-out, well-built, and very inviting.
The lobby is grand with the open atrium (with a piano player usually), but I really like the rooms. They have great desks for working, with very new and comfortable furniture. Everything in the room just feels brand new and polished and really well taken care of. And they have complimentary coffee and tea in the room, complete with a coffeemaker.
I have stayed at other hotels in Frankfurt, but I think this is the best by far. No pretentiousness of the other high-end hotels, and all of the comforts of a great hospitable hotel.
Other little things: a very good room-service menu even for late at night (if you arrive late), and a great health club.
This review is the subjective opinion of a TripAdvisor member and not of TripAdvisor LLC.