How much does it cost to live in southern France?

I'm an American looking to study abroad in Aix en provence next year. Visa application says your monthly allowance should be $680, so around 469 euros. I'm a college student so I don't spend $680 a month, and I'm in California! What costs 469 euros a month as living expenses? (I already got housing taken care of, so that money I guess is just for food and fun...)