We were very impressed with the quality and size of the room. Not only was there a large room with comfortable beds, but also a kitchen with facilities, and a good-sized bathroom with bath. I don't know if this a standard room in this price range but hopefully when we go there again, we will find it is.
We went a short distance in the car to the centre and had a nice chinese buffet meal. The weather was bad so we did not explore further though there a few other choices in the immediate area.
We travelled to Dusseldorf early in the morning and had some difficulty finding the centre, especially in the dark (our sat nav had broken down) - but the actual distance is not very far, so it is convenient enough to return to this hotel, rather than go to more central ones we have visited in the past.
We hope to explore the hotel's facilities further next time, when we have more time.