Very solid business hotel with clean, bright rooms and modern ambience. Great breakfast service, good parking garage, friendly reception and restaurant staff make for a pleasant stay.
Rooms have all the necessary furnishings and ameneties for business travelers, but some features could be improved (i.e. more modern TV, better lighting for work desk, etc.). The rooms are also very quiet. The only real drawback is the so-called air conditioning system - which really is just a fan blowing warm or cold air into the room. For normal weather, this is perfectly fine - but for hot and humid summers a "real" AC unit would be great to enjoy a good night's sleep.
The F&B service in the restaurant and from room service are very good - and the restaurant terrace overlooking parts of the city gardens is beautiful in warm weather.
The hotel is often used for corporate events and meetings, and thus, can be a bit busy sometimes. However, the premises are spacious, bright and well maintained. Thus, it's always an enjoyable atmosphere in the public areas.
A real plus is the close location to Duesseldorf and the short driving distance to Cologne. However, the hotel is best used for travellers with cars ony opinion.
Prices are very reasonable for a four star hotel, and I can personally recommend this Dorint hotel full heatedly.