That's amazing, I've never really thought of Austria as a very BTC-welcoming country, but after coming across this thread, and looking at a couple BTC maps and news article, Austria is actually quite welcoming for a European country.
It's a bit weird why there are accepting BTC before the other payment options. I personally would pick other fiat options over BTC due to popularity and adoption, but it's a brave move from them.
This is superb marketing for Bitcoin. It's a pretty big deal that large corporations slowly but surely follow the trend and are less afraid to try out something new.
It would be cool if they accepted Bitcoin through Lightning as well, which would generate them even more publicity because that's technically speaking where we are heading to when it comes to day-to-day transactions. Most of what I spend nowadays is done with Lightning through Bitrefill. I'm definitely looking forward to more adoption in this field.
It's great PR for sure. I don't think they'd bother with the lightning network, I doubt a lot of people there (except the enthusiasts) know about the lightning network there.