We have reserved a number of rooms in the CERN hostel. They are all comfortable single rooms for 58CHF a night.
You can reserve them alongside with your registration. These rates are very competitive for the Geneva region. They are on the CERN site, so the closest you can get to the codesprint and conference venue.
Even though we have pre-booked a large number of rooms, they will be allocated based on "first come, first serve" basis.
More information about the CERN hostel are available here: