This car rental experience was extremely disappointing, particularly due to Klass Wagen's hidden mandatory charges which were very unsatisfactory. I had already purchased full insurance in advance through the Zuzuche platform; however, when picking up the car at the counter, the staff explicitly informed me that they didn't have any historical damage records for the vehicle. They said if I didn't pay an additional 190 Euros to purchase their insurance, 'any damage—whether new or pre-existing but unrecorded—would be my responsibility, and up to 2600 Euros could be directly deducted from my credit card.' In this scenario, the so-called 'optional insurance' was practically meaningless and essentially a disguised mandatory fee. My first instinct was to cancel the booking and rent a car from another company, but upon further investigation I found that all other companies, including Hertz, AVIS, Enterprise, etc., showed no availability of cars on the same day—only Klass Wagen had vehicles available. This raised suspicion about whether they were intentionally manipulating car availability or even sharing information in some manner to create a 'no other option' scenario, thereby forcing users into accepting these additional insurance charges. Since I had already wasted time going back and forth between the airport and their office and it was already 7 PM (and I still had an hour-and-a-half drive to my destination), I had no choice but to reluctantly pay the 190 Euros to pick up the car. On a positive note, the Zuzuche platform’s customer service was very professional and responsive; they actively assisted throughout the process and ultimately helped refund the insurance I originally purchased on their platform, which I deeply appreciate. Nevertheless, I strongly urge Zuzuche to enhance supervision over Klass Wagen's hidden mandatory fee practices to safeguard users' legitimate rights. Additionally, I advise other renters that if you must choose Klass Wagen, ensure to confirm their insurance policies and vehicle conditions in advance, keep all evidence of car collection, and avoid falling into similar traps.