When picking up the car, the lady which services us was very friendly and informative. She took her time with us and answered all our questions.
I loved the fact that even though we picked the car up from the French side of the airport, we could drop it in the Swiss part. This made is very easy for us as the end of a long trip.
When rending a car, I am always worried that I will not get what I booked in terms of model, size and specifications, but this was not the case with SIXT. They do their best to provide the exact booked vehicle or offer a great upgrade, when not possible.