The booked BMW 3 Series was unavailable and downgraded to a Peugeot 308 with five seats. The staff initially had a poor attitude and tried to make me accept the downgrade by offering a half-tank fuel return. Later, after contacting Rentalcars.com customer service, Hertz finally admitted the downgrade. Currently waiting for after-sales compensation.

The booking was confirmed, but there were no cars available upon arrival.

The attitude was just normal. The problem was that the staff gave incorrect instructions for picking up the car, causing us to run back and forth three times before finding the staff at the parking lot to get the car. Another issue was that we were supposed to get an M-class vehicle, but we ended up with a B-class car. Additionally, we initially agreed to purchase their insurance, but after consulting with the rental company customer service, we decided to cancel it. The staff agreed to cancel it on the spot, but when we returned the car, we were still charged over a hundred euros for the insurance. It was really frustrating.

Our car did not arrive on time as scheduled. When it finally arrived the next day, we found the trunk was too small. However, the company's staff was very responsible and arranged for a car with a larger trunk from another company, solving our problem. Their attitude was great.

We indeed got a Mercedes ML250. We chose the rental and return location at Frankfurt Central Station. The rental office is inside the train station. We met a kind German who accompanied us all the way to the office. The car is in the underground parking garage P3 of the train station, and the pick-up and drop-off are at the same place. We were worried about additional fees, but today we received the charge notification, which matches the order amount, so we are relieved. It's worth noting that the rental office doesn't inspect the car with you in person, so we were worried something might come up after returning home. Fortunately, all was well.