Car rentals in Paris are incredibly unreliable. Renting through Ctrip is a reliable option, as they help coordinate and resolve any issues. We previously rented a car through another Ctrip company for a 10:00 PM pickup, but upon arrival, they told us they had no cars available, and the staff didn't know when they would be available. We called Ctrip, and they immediately helped us arrange a rental at a nearby Sixt location. The car was in excellent condition. It was significantly more expensive, but Ctrip covered the difference.