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A perfectly organized conference hotel for larger groups! We held a conference here with colleagues from Western Europe on behalf of STIHL and can wholeheartedly recommend this venue.

The Collegium is beautifully situated and well-suited for a conference away from the hustle and bustle of Frankfurt. The rooms are tidy – as befits a high-end training center – and in very good condition. In some places, the building shows signs of its former popularity, with its somewhat bulky, concrete construction. However, there is also a modern section with a very attractive, open-plan conference room featuring large glass windows (see photos). The food was very good, better than in many conference hotels, the breakfast buffet was very extensive, and the staff was very friendly.

I recommend this hotel, very clean and well-kept, very friendly service, delicious food

A fantastic hotel for groups and seminars. The rooms are large and bright. The bathroom has a small window into the room, so there's natural light there too. Plenty of free parking and very quiet. The food has always been delicious, with very few exceptions. Great team.

Beautiful, spacious rooms with balconies and lovely views. Although somewhat secluded, it's very quiet. The food is excellent and the staff are courteous and solution-oriented.

Nice hotel for a short trip. Dinner and breakfast were very tasty. There was a wide selection of vegan options at breakfast. Unfortunately, there were no bathrobes for the spa area, and only a few small towels were available. There were also very few loungers. We were lucky, but there were many guests without loungers. The beds were a bit worn.

We were completely satisfied. The pool is a bit cold, but once you get out of the sauna, it's perfect.

We stayed at the Collegium for one night to attend a birthday party nearby. Booking was done through Expedia and was hassle-free. Overall, the hotel makes a decent impression. Our room was newly renovated and modernly furnished. The breakfast buffet is extensive. The reason for my rating, however, is the remote location. We wanted to take a taxi to Idstein. The receptionist recommended booking a taxi in advance. In the end, the taxi was 20 minutes late and charged €15 for the trip from Kronberg... I recommend comparing prices.

The rooms themselves are really nice – bright, spacious, and clean. The same goes for the bathroom. We were a bit irritated by the completely unexpected window in the wall between the sleeping area and the bathroom. It's certainly great if you want to watch your fellow traveler shower and defecate. But then again, that's perhaps more for a very special clientele. This arrangement is rounded off by the glass sliding door to the bathroom, which only opens quietly but otherwise doesn't dampen any noise, ensuring that you're guaranteed to hear the other person going in. This makes every visit to the bathroom a very special experience, even audibly. A feeling of being there was a bit too much for us... I'm sure some people like that, but we would have preferred a bit more privacy here. The view from the balcony was fantastic, the magnificent breakfast lifted our spirits, and the staff was very friendly, too. Still, advance warning about the window (or the option of an activated privacy screen) and a proper door would have been great. Unfortunately, the experience of staying here will likely remain a one-time occurrence.

Great, very well-maintained location. Very attentive service. Delicious buffet. Incredible 70s brutalist architecture. Overall, very cool. I recently (2025) had the honor of holding a graffiti workshop in the parking garage.

I was really looking forward to the swimming pool and sauna, which were explicitly promised on my reservation form and were a deciding factor for me in booking. Upon arrival, I discovered that the swimming pool, sauna, and fitness area were closed for the entire duration of my stay – without any prior notification. When I inquired, I was not offered an alternative. Precisely because these were a decisive factor for me when booking, I find this misleading and not customer-oriented. I would expect guests to be transparently informed about restrictions prior to arrival and that a reasonable solution would be offered. Unfortunately, this leaves a very disappointing impression.