CERN offers affordable on-site accommodation for workshop participants, with a variety of room options available at different price (from 27CHF to 58CHF per night). Bookings for CERN accommodations are only accepted up to 4 months in advance. Due to high demand and multiple events taking place at CERN, availability can fill up quickly. We recommend booking as early as possible to secure your accommodation.
There is also a wide choice of hotels in Geneva and Pays de Gex (France), which you can compare using your favourite hotel booking site. Prices tend to be relatively high and can range from 70 to 170 EUR (80-200 CHF) per night for a 2-3 or low end 4-star hotel.
Given that CERN is located right on the border between France and Switzerland, it may be worth getting a hotel in France (St. Genis, Thoiry, Prévessin, Ferney-Voltaire, ...). Otherwise, if you choose to stay in Geneva, be sure to pick a hotel with public transport close by. Tram line 18 goes from the centre of Geneva straight to CERN.
A (non-exhaustive) list of hotels in the area, compiled by CERN, can be found here.
