I'll be in Frankfurt at the end of the month and i'm looking to rent a car for 3 days.
Which one of the companies that are located at the airport have the best service? Should I go with Avis? Sixt? Or another company? because there are some scary stories on the net regarding car rentals.
Also, I'm planning a one day trip to luxembourg. Is there any problem using the car? Although there are different countries there are both inside the EU, members of the Schengen Zone.