I rented two cars from Sixt through Expedia.com. I thought I reserved them for May but received an email in February saying it was time to pick out my cars. I have no evidence of how that happened. I tried to cancel the week-long rental. I was willing to pay a cancellation fee or just shift the reservations to May, but Sixt charged me for both cars for the entire week in February. They blamed Expedia even though Expedia had written them an email on my behalf. It's simply unethical. My guess is that Sixt rented the cars out for the week, so they were paid twice. BEWARE of both organizations.