thanks gabysmum, will keep that in mind about car seats not being able to be used back in Oz.
Thanks Ryn for asking your friend too, i did check out the Austrian auto club, but have to get DH to read it 4 me as i can't read German and there doesn't appear to be an english version. But it will still work out cheaper to hire one thru them for 39 euro even if its per month than the 280 Euro for 6 weeks that the car hire company wants to charge us...