I am deeply disappointed with Kayak and with sixt. I needed to advance the rental date 15 days, so I did it well in advance. At no time did KAYAK help me in the process, they only indicated that I contact Sixt, and they told me to contact KAYAK. A disaster. Finally I had to rent in another Europcar and lose my money already paid. There was no kind of refund because they said that the cancellation fees were equal to the value paid. an absurd . I felt cheated. Ha, but I will hire nothing again with Kayak, nor with Sixt.