In reply to ian dendy:
Actually, this is about what's now generally referred to as the Stubaital Höhenweg, or Stubai High-level Route, which was originally called the 'Rucksack Route'. ie the lower of the two routes. Both routes visit the Franz-Senn Hut. The higher one involves glacier crossings, which makes it hugely less popular because most people don't feel competent to cross glaciers. The 50 Euros a day I mention assumes Austrian Alpine Club membership, which also provides valuable rescue and accident insurance.