There is nothing, nothing, like walking into an interview and saying "I just flew in from a deforestation project I'm doing in Costa Rica" or "I just got evacuated from the Darfur border" or "I've just finished an internship working on health policy in Austria" - hands down, they love it. It will completely derail the interview (generally) in your favor (if you are doing it for the right reasons and have a solid head on your shoulders).
It's a pain in the arse. That said, Austria shouldn't be that bad. I was in internet-intermittent middle of Africa where insects were my most constant companions. So you'll be fine. Just make sure you have someone VERY VERY reliable on this end. I'd also look into getting a "Power of Attorney" so someone (like your father, or brother, or husband) can sign legally for you, sign checks for/from you and so on. Especially if you're out of the country for more than 4 months.
Also, applying from abroad gives you MUCH more leway in nagging schools, I sent an email indicating that I was going to be back for 3 weeks, and over half the schools offered to interview me in those three weeks, so it really helped with stacking my interviews (which is a whole other can of worms). IF you do stack your interviews (which you will have to if you apply from abroad), apply EARLY, I mean EARLY. And make your 3 week plan to come back sometime around Thanksgiving. And then email them two months before you come back, then one month, then call.
Okay... I think that's all I can think of... but personally, applying from abroad was one of the best things ever for me about the whole process. It wasn't easy, but it was worth it in the end.