I can warmly recommend the Gasthof Pferdapfel on the slopes of Mischtberg. Hop on the S19 at Zurich HB and connect to the bus at Schissikon - the gasthof is only ten or fifteen minutes up the hill.
The proprietor is a very friendly chap and you'll be offered all kinds of delicious local delicacies during your stay. Stay clear of the schnapps, though - it's a strong flavoured yellow liquid, the taste of which will take much too long to leave your palate.
There are almost certainly still vacancies for the holiday period. Give Bruno a call on 033 821 64 54 and ask for the Imboden Spezial.
Have fun!