In the EU credit cards are very widely accepted, including paying for fuel, though not all seem to work in "pay at pump" machines. Bear this in mind and always carry local currency - fortunately the Euro is the currency for the more advanced members of the Union. In some countries (eg France) a lot closes on Sundays so you may find yourself dependent on "pay at pump".
You card company will convert from Euros/whatever to your account currency at rates that IME aren't too bad. Good idea to let them know you're going abroad, of course.
AMEX is less widely accepted due to its high charges to vendors.
Plenty of ATMs around, the place is largely crime free, probably easiest to carry a week's worth of cash with you to cover food and fuel, leave the card for hotels and emergencies.
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