Nice hotel and wonderful location, allowing you to walk in the Taunus hills pretty much right from when you exit the hotel.
Good service overall, except for breakfast. (Breakfast service was quite slow and on our final day, the tea water only lukewarm. Presumably, the reason was that throughout the weekend we stayed there, they had more visitors than expected. Staff tried hard to make up for it.)
The spa area is nice, if a touch small. (There is one, quite small, Finish sauna and one 60-65 degree bio sauna few people used, leading to the Finish sauna to get fairly crowded at times; a steam room would have been nice.)
The gym is in a different building, accessible through a fairly long, underground pathway. For a hotel in this category, the cardio equipment is a little limited and well-worn.
The bar and the hotel park are very nice indeed.