Originally Posted by FLYGVA

Unless you hold Diamond Status with Sixt (or rent a Premium Car like S-Class), when they have the car on the VIP parking next to the exit, you have to walk to the airport parking garage. There is an office, where you can report the damage.
The Sixt Outlet in the Maritim is basically at the other end of the terminal (read concourse c) and the Maritim is connected with the hotel by covered walkway. The parking is underneath the hotel.

For what it's worth. There are a McDonalds and some other food outlets in the basement of the terminal next to arrivals and a Starbucks and other outels in the departure hall, if you need a place to wait for either train or rental car.