Hi,
I do not know what the customs are here wrt to flat sharing.

I will be looking for a place to sleep for a 3 month in Lenzburg area, and wonder whether I should bother applying for offers at wgzimmer.ch/students.ch?
Or should I try rather to find a cheap hostel/appartment instead? If so, then where to look for short term inexpensive accomodations, as homegate.ch and other realtors web pages are targeted at long term rentals, and short-term appartaments are targeted at more affluent/shorter stay, i.e. less price-sensitive market.