The two staff members at Hertz Munich Airport were very nice. We encountered some issues when picking up the car, but after four to five hours of effort, they eventually managed to rent us a car. Returning the car in Frankfurt was very convenient; the staff just drove the car to check the mileage, and that was it. They didn't inspect the exterior, possibly because we had purchased the comprehensive insurance. We had reserved a BMW X3 but were given a Volvo wagon instead. The car was a diesel model, very new, with many features and a built-in German navigation system that was quite useful during our trip.