With Hertz, there were quite a few people, but it was still manageable.

Had to communicate back and forth; the car model was not correct, and they couldn't provide the booked car in the end.

Received two charges of 31 euros each four months after returning home. I got a parking ticket in Sorrento, Italy, and paid it in cash on the spot. I suspect someone is stealing money. Be very careful when parking a rental car in Italy, they're desperate for money now.

Received fines two months later, found many similar cases online

It took a while to complete paperwork thus time. I’m not sure why as Zi am a Gold member and have rented from this office 4 times in the last 6 months. The car they finally gave me was not the category I rented and much larger than I wanted. I had to change it in the garage and had to wait again for a smaller car. All in all, it was a very long process to rent a car for a day.