were to exchange money for austria, in
US before leaving at the airport or at
a bank or there?

Neither. The best way to get your euros is to use the ATM once you arrive in Austria. Exchanging at a bank or exchange facility, either here or there, is by far the most costly way to do business. Call your bank and let them know you will be using your ATM card overseas.

P. S. I clicked your name and I see you've been asking all of your questions about this trip in the US forum. You will get more replies by posting your questions about Austria in the Europe forum.

If you feel you must have some money when you arrive change a small amount - no more than $100 at the brueau de change in your departure airport.

When there use you credit cards as much as possible and pull walking around money from ATMS (linked to a checking - not savings - account) to get by far the best rates of exchange.

Check this thread for CC recommendations:

http://tinyurl.com/34u4ju

Also, do a search for 'currency exchange' where you will get good information.