The car rental experience was very poor. For their own benefit, they refused to assist with any difficulties faced by renters, which was disheartening. I will never rent a car from the CARWIZ rental company again.

We always rent cars for self-driving trips when traveling abroad and have generally had great experiences. However, this time on May 3 at Belgrade Airport with CARWIZ, it was disappointing. Here's what happened: the primary driver forgot to bring their credit card, and the company would not let us pick up the car. We proposed two solutions: 1. Use cash for the deposit or have a traveling companion's credit card pay the deposit; 2. Replace the primary driver on the booking with a traveling companion or rebook under their name. Both were rejected. The only condition given by the company staff was to pay an additional €650 for full insurance; otherwise, we would not be allowed to pick up the car and the already paid rental fee would not be refunded. Ultimately, after some bargaining, they allowed us to pick up the car after we paid €620.
Additionally, I want to inform everyone that the car's exterior condition was quite poor, with over a dozen noticeable scratches and dents. Since I opted for full insurance, I didn't bother negotiating further. Overall, this car rental experience was very unpleasant. Please take this into consideration.