Adding to the other comment, this is a really nice hotel in a beautiful old castle (Schloss in German). Slight correction to the other review, the hotel actually is located in Bensberg (the reason for the name) which, while officially part of Bergisch Gladbach, has its' own charming city center eight kilometers (five miles) from the Bergisch Gladbach city center.
The Schlosshotel is part of the ultra luxury chain Althoff which also has the beautiful Schloss Lerbach in nearby Bergisch Gladbach (with one of the best restaurants in Europe). In the Schlosshotel you should also make sure to dine in the Vendome which is Michelin star decorated and won Restaurant of the Year by Germany specialty magazine Feinschmecker in 2001.
Try to get a room with a view towards Cologne since you might be able to spot the spectacular Cologne Cathedral on a clear day. Standard rooms are nice but a little small. If you can afford it, book one of the nicer rooms, it is worth it.
Staff is very friends and speaks perfect English and many other languages. The hotel has quick Autobahn access to Cologne so could also be used if having to work in Cologne. When I stayed there in 2002 there were some small service issues which will have very likely been taken care of by now.









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