We called them a few days before we landed at the airport and reserved a car with them via the phone. The price was more economical directly with Sixt than through third party websites like Booking or Kayak. We got an automatic transmission car for three days and it ran smoothly. We did all the popular routes in Salta and Jujuy without any problems. If you drive automatic, I recommend booking early because most cars in Argentina are standard transmission. If you have a foreign passport and foreign driver’s license, you can pay in cash. Otherwise, you would need to pay in card. Overall, Julio and Juan helped us with everything car-related and even travel-related. Wonderful experience. All their cars are under 60,000 kilometers. I recommend them!