To bring a few counter-points to the praises listed on the web site:
You want to work at a startup? Great! But don't go to Vienna then. There are a few startups, but most of them finance themselves via part-time consulting work, as the chances of getting "real" investments are quite low. And almost all of the successful ones that I know move to places like London or Berlin as soon as possible.
Salaries are low. And I mean low. If you're used to salaries at places like SF you're probably paying more for your apartment in those places than what you're net income in Vienna would be. And forget about stock options, even at the so called "startups" there they are quite rare.
It feels like almost everyone smokes in Vienna. If you're ever going to a restaurant or a bar, even if it's only a brief visit, be prepared to wash all of your clothing afterwards. There are practically no laws protecting non-smokers, although those are nowadays standard in most other modern cities.
It rains almost all the time. There are something like 2 months of summer and 2 months of winter. The remainder of the time is cloudy rainy weather. So yes, there would be a few nice places where you could do stuff outside, but only during the short summer time. And don't expect any clean parks where you just can lie down and enjoy the sun (like in SF). Most of the city parks are dirty. And most people don't clean up after their dogs, so you wouldn't want to lie down in those parks anyway.