Below are some hotel options in and around Lausanne. Most of these have fixed rates for Psi-k attendees (for those, prices and booking details are given below). A few of the hotels below do not pre-book rooms for large events but are nevertheless highly recommended. These are by no means the only accommodation options and we certainly recommend that you explore other possibilities.
Closest to the conference venue (EPFL campus and around)
Lausanne city center and around
Affordable options a bit further