Hi Stann.
I did a similar job in the summer, flying to Prague and then on to Budapest for a festival.
They have an excellent international coach service that we were able to make use of. The trains took the same amount of time but cost 5 times a bus ticket. The buses are quality, higher than bus eireann. Bathroom on board, 2 free cups of coffee, earphones for the dvd movie playing, radio etc.
The company was Orangeways(there is another that may run called student direct) and they operate every conceivable route across europe. Our bus stopped in Bratislava main bus station for a 15minute break.
They had buses going to Vienna eastwards, very nearby. Our bus from Prague to Budapest cost 15 euro and was the length of Ireland morealess.
I'd say you could get a bus to Vienna from Bratislava insanely cheap and it would only take an hour or two(guess!). We heard from other festival goers it was a popular exit route.
Hope that was useful
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