You can consult the following websites / groups to find an accomodation in Zürich
Woko
Juwo
WGZimmer
Facebook: Housing in Zurich
Facebook: Wohnung, Zimmer, WG - Zürich [flat, room, shared apartment]
Facebook: Sharing is Caring Universities of Zurich/ETH (UZH/ETH)
https://www.wohnen.ethz.ch/en
Student houses