If you need to book accomodation for your stay, there are various options. One option is to stay at the CERN hostel which offers very basic rooms with shower and WC on the CERN campus. Please make sure you book early, as these rooms are often fully booked.

A list of hotels offering preferential rates to CERN in neighbouring France and around Geneva can be found here. Please note that hotels on the French side of the boarder are easiest reached by car as public transport is scarce.