Staff is very understanding and they did help me well when I made a reservation mistake before my travels. As Platinum elite I've asked for an upgrade of the room which I got but the room was dated
(80's style) had a small-ish, not sure if queen size, bed. The air conditioning was working very well and the room was spacious too. They do have newer more contemporary rooms though. Breakfast was very good and an abundance of choices.
The CityCenter is walking distance, though hotel location is difficult to judge as many worthwhile things to visit are a bit scattered throughout Essen. [Less]