It was a fine car we got and the pickup and delivery went smooth. We got an invoice with the total and fuel all done within the 20 minutes of delivering the car.
No extras or hidden fees. We also bought 0 insurance as I have that already covered from home. No issues with Sixt and they didn't charge anything for the damages there was on the car (they were there from the beginning).
The car was new and had only gone 8000 km approximately.
Overall I recommend renting your car here if you need it for your trip.