The car was nice to drive, service was quick, but I had to take 2 floors of stairs with all my luggages before I could use a lift. But this is not a big deal for me.
I arrived Paris downtown 1 hour before my return time, then used that 1 hour to fill up the gas tank, but could not do it. I tried 2 gas stations, both about 1.5km away from the SIXT office. 1st gas station only accept card, but all my credit/debit cars from the US were rejected, which I had been using in Paris for a whole week without any problem, 2nd gas station is out of gas completely! And there was only 20 mins left to return the car. So I have to let SIXT fill up the gas for me.
The price in gas station is E1.5/L, SIXT charged for E3.6/L+E12 service fee, and of course you also over count the amount of gas needed to fill up the tank at some point. I was charged E45 for 1/4 tank of gas (12L) for a small car (Opel Astra), actually L12XE1.6/L=E20 is enough at gas station, so I was over charged for E30.
I rent car often, and have only seen other car rental companies to over count the amount of gas needed a little bit, but the price per L is usually not too crazy, and never seen a fee for service.
But you use all 3 ways to rob my money, expensive gas per liter, over count gas liters, and service fee. Good job!
Advices for customers: fill up the gas before entering Paris downtown, or plan 2 hours to fill up the gas in Paris, or pre-buy the gas from the rental company.
After the original review in Dec 2019, the company contacted me real quick and refunded me some of the gas $ they over charge me. Because of this good customer service, I am rating them from 3-stars to 4-stars now.
Anyhow, I love Paris, France!