I can certainly understand your aversion to paying a higher rate at Thanksgiving, which of course is not usual in France. Don't know what they think they are doing.

As a European landlord (though not in Paris), I am happy to agree with clevelandbrown, that to accept payment in another currency is a nuisance and involves extra work. Also, that the rate you see on xe.com is not the rate that you as an individual would get when going to the bank. That's why we price in euros, and accept payment in euros.

But it sure looks as if someone is trying to pull one over on you.

If you're traveling November 2007, you have plenty of time to look around. If you're having trouble with this apartment landlord, I'd look for another place pronto. No need to feel there's only one place to stay in Paris! Search this forum for many apartments recommended by Fodorites. Good luck planning!
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Unless the owner rents ONLY to Americans, there are about 8 or 9 other reasons why that week could be considered "high season." Holidays in the UK, Belgium, Germany and Italy have a lot more influence on availability of accommodations in Paris than anything to do with North America.