Pretty good.

Since we arrived in Frankfurt on an early flight, there were two groups before us, and we waited for a while. I had booked a seven-seater car. The customer service offered us a five-seater Volvo going back to Zurich with a 450 Euro one-way rental fee if we were willing. Considering our comfort, we decided to stick with the seven-seater we originally booked.

Frankfurt Airport has clear signage, making it easy to find the car rental shops, as all rental companies are together. Picking up the car is very convenient. Following QEEQ's instructions, I showed the staff the translation, driver's license, and order, and the process was done very quickly. I booked a BMW 5 series but got a Mercedes E-class wagon. The car was in excellent condition, with only 20,000 kilometers—pretty much a new car.