I wanted to share my bad experience with Airport Valet Parking Düsseldorf last summer.
After our trip to Ibiza in August we came back at the improvised parking lot of this company to find that the set of original car mats was gone. Almost to strange to believe. That's what the staff thought too. I had a remark made on the voucher and the guy there promised me to talk about it with his boss and that they would send me an email. When we came home we also found out that a box with tools (that was underneath the drivers seat) was missing. I told Airport Valet Parking by mail about that loss too. I never got any reply. Never heard anything from them.
So people, watch out to park your car at Airport Valet Parking Düsseldorf !