Arriving at Geneva Airport (link is external)
You can take public transport between the airport and CERN (Meyrin site). CERN and Schuhman (for St. Genis hostel) are the appropriate bus stops to come to CERN hostel or to the Residence Schuhman hostel with bus or tram.
At the Airport, take a free bus ticket from the ticket machine in the baggage hall area, before you exit through customs. The "Unireso" ticket, issued free of charge by Geneva Airport, enables you to use public transport in Geneva area for 60 minutes.
You can also contact the CERN hostel reception up to 01.00 a.m. at +41 22 767 33 44.