I've always rented from HERTZ, and generally, there are no issues. I've encountered both enthusiastic and average staff, and I've never had to wait in line.

The engine failed to start twice: The first time was the day after renting the car, in the parking garage of the exhibition hall, it would not start. I called, but both breakdown numbers on the car key were unreachable and automatically disconnected! I tried the phone number on the rental platform, and after several transfers and explaining the situation, we waited for about an hour for assistance. During this time, I kept trying to start the car. Shortly after the phone contact, it miraculously started. Due to our tight schedule, returning to the airport to exchange cars was not an option, so we agreed that if it happened again, we would stop using the car. Miraculously, after four days, on the last day, while on our way to the airport, we stopped at a gas station to fill up the tank before return. After refueling, the car wouldn't start again! Tried all the phone numbers on the key and the rental company number, but none worked. The rental platform's phone said they couldn't help and asked us to call the breakdown number. Rushing to catch a flight, after about forty minutes of attempting to start it, it worked again! The car had only around 7,000 kilometers and was a 2018 model, so it should have been in good condition, but it was definitely a problematic car! Originally rented a Volvo V40, but was told at pickup that it was upgraded to a Jeep Wrangler. I thought I was lucky, but later felt it was a trap! It was a scary experience!

Efficient car pickup.

There is a service point right at the airport, the procedure is simple and fast. Although the vehicle was upgraded, there was no choice available, you have to accept whatever car they give you.

The service at the Frankfurt Airport branch in Germany was just average. When picking up the car, a hold was placed for a full tank of fuel. I booked a Benz C but received a Jaguar X20d diesel car instead. The car felt a bit small, especially the trunk, but the diesel engine did reduce travel costs. I was a bit late returning the car, having mistakenly entered the underground parking and returning it just over ten minutes late. I was charged an extra day because I picked up the car slightly early, despite confirming with the staff that I could wait until 9 AM to collect it. They agreed, but still charged according to the scheduled time. During the pickup, I noticed minor paint scratches and discussed them with the staff, so the actual pickup time was around 9:30 AM, but I didn't ask them to reprint the pickup contract. In the end, I had to negotiate with the manager at the branch, explaining the situation, and they ended up charging me a little under 15 Euros. Typical Germans, very rigid! While they weren't wrong and had a strong sense of contract, their service awareness was practically non-existent!