Fantastic experience with the Sixt Madrid Airport office. Incredibly kind and helpful staff, very prepared to answer any question or concern in regards to the car or driving regulations in Spain.
We first rented a BMW 1 series, and the process went very smoothly. There was a small hiccup with the car, as the service light went on, and the Sixt Road Assistance was very helpful and supported us in getting back to a Sixt Office safely.
We had to exchange the car, so we returned to the Sixt Airport Madrid office, where the staff was once again incredibly accommodating and swift in their managing of the situation. They were able to accommodate the request (automatic, sat nav, strong preference for a BMW) in a professional manner, and there was minimal waiting time to receive the keys to the new car.
All in all, I will be sure to recommend Sixt car rental services in Madrid.