Just a little tip: if you're travelling up the Großglockner, it's worth spending two days in the Matrei area. It's East Tyrol and very unspoilt if you want to spend a day hiking, e.g. the Europa Panorama Trail. There is a large hunting area around Matrei and the area is famous for its delicious game dishes.
https://www.osttirol.com/en/discover-and-experience/summer/hiking/detail/europa-panoramaweg/The other side of the Großglockner Pass road in Zell am See is the opposite. Very Russified, at least a few years ago, and very crowded. But maybe that's better today.
