Just about every car rental agency you can think of has a European operation — Hertz, Avis, Alamo, Budget, and National to name a few. You could spend hours on the phone or visiting their web sites to compare quotes, but I find AutoEurope to be the fastest, easiest and cheapest.
For over 50 years AutoEurope has provided the best combination of price and service when it comes to European rental cars. AutoEurope is actually a broker, comparing rates from the major car rental firms and finding you the best deal for your specific situation.
With every rental from AutoEurope you get:
• written confirmation of your rental, with clear details about the cost, what's been pre-paid and what's due at pick-up (guaranteed in US$)
• the support and service of a major rental car company (you'll usually pick-up your car from Avis or Europcar)
• a toll-free number to call in Europe if you have any problems or questions