...you come for studying in Ulm!
But it's great that you have the 3 month unlimited eurail pass, so there is no problem to come to austria.
The train-connections in Europe are really good.
Would be great to meet up with you guys, but have you got so much time left to travel around?
Then we can make a high-speed travel at Austrian Autobahn
We have a limit on Autobahns, but sometimes I don't care about it (late at night).
In germany I don't know any fun-car-rental company.
About 40 km away from my town there is one, where you can drive Porsche GT2's, Ferraris and Lamborghinis and so on, but it's very expensive!
http://www.creativ-fun-team.com/
mfg hrc