Just came back from a family vacation in Guadalajara. We’ve rented a car from Sixt. I booked it online 6 days in advance. Also reserved 2 toddler car seats. Received a reminder from them 1 day before the trip, also emailed to confirm our kids seats and received an immediate reply back. They met us at the airport, it was only us so no waiting time at all. Very nice and friendly. Car was almost new, clean. Car seats were not - but I didn’t expect them to be perfect. They were ok for a 5 day trip. If you have high expectations I strongly advise bring your own. We used our credit card insurance. So had to leave $1,5k deposit. Was returned at the arrival. We had a great experience with them. Thank you, Sixt! I recommend :)