I have rented a car once before with Sixt in California, and everything went smoothly. Not so this time. I made a reservation for a car in Quito, Ecuador. Within a couple minutes of making the reservation (not before), Sixt let me know about a mileage limit, which turned out wouldn't be enough for the trip I wanted to make. I tried calling Sixt locally in Ecuador, internationally at their 888 number, as well as tried to cancel the reservation through the booking agent. None of it was successful: Sixt never answered the phone locally; the international number would not connect me to an agent (the call dropped 3 times before I gave up), and after an hour messaging with Priceline / Kayak, neither was able to resolve the issue. I eventually opened a dispute with my credit card company, which has temporarily refunded me the reservation money, but the official dispute can take months to resolve, and I don't know what the final verdict will be. Overall, I'm extremely disappointed with Sixt this time around.