I had a great rental experience. Booked and prepaid via the Sixt app, which was almost half price. Car was ready when I arrived, and they were very responsive via WhatsApp - no problem to extend for two extra days. Return was quick too. The car was a little old (no Bluetooth) but in good shape. It had some dents and scratches which they did not go over very strictly, but they were also relaxed upon return (not that I made any new scratches). Will definitely rent from here again.