I rented a car last month, went very nicely and the female staff there was quite nice and understanding, she even helped me save 100 euro on an older car I rented (because of some rules I didn't understand at the time)
Car Hire Düsseldorf Deals - Sixt rent a car
A car hire in Düsseldorf allows you to explore one of the most exciting cities in Germany. What's more, when you choose Sixt car rental, you will be able to collect your vehicle from over half a dozen locations citywide, including the airport, meaning you can literally fly and drive. Your car rental agreement in Düsseldorf can be structured to suit your personal desires so if you wish to purchase LDW insurance for yourself or additional drivers, that won't be a problem. There are dozens of brand new models of vehicle to choose from including a great range of family cars, saloons and a variety of luxury convertibles and sports cars too. Satellite navigation can be installed in all vehicles, aiding you to navigate Düsseldorf. Open till late, 24 hour returns can be arranged without a problem.