I rented a car from Thrifty, and the return process was extremely frustrating. It took from 3:30 PM until 7:49 PM to finalize it! Due to an incorrect return location provided by the rental service (I've already contacted their customer support to resolve this), our plan to return the car in the city center was redirected to an IKEA location even further than the airport. So we decided to compromise and head to the airport. The first time we went to the airport, the Thrifty staff said this was not the designated return location and we would need to pay an extra 55 euros. We were confused, but since we had some time left, we decided to look for the IKEA return location. After wandering in the dark and failing to find it, we returned to the airport ready to pay the extra 55 euros. Fortunately, a different staff member helped us and didn't charge us the extra fee. However, by that time it was too late to refuel the car ourselves, resulting in an additional 50-euro cost!