From the airport take the highway A3 to Chur exit Rüschlikon/Thalwil then following the signs "Hotel Belvoir".
by public transport:
From Zurich airport take the train service S2 to Zurich Main Station ("Zürich HB"). From Zurich main station take the train service S8 direction "Pfäffikon SZ". Get off at "Rüschlikon" and take the bus route 165, direction "Rüschlikon, Moosstrasse". Get off at "Rüschlikon, Belvoir". (journey time from the airport/main station: 49/26 minutes, service interval: every 30 minutes).