In reply to Kai Autio:
JoSiTo is organised, Germanic and efficient, but can feel a bit cold if you aren't there in a group as it often appears that a lot of the others know each other (they may not do, but I suspect a common language helps make it feel so).
Kezban is probably more friendly, but also less organised. Less good showers/toilets, our friends who were staying there ate at JoSiTo for breakfast most days as well, although the food at Kezban was pretty reasonable, although I think you have to order in advance, whereas you can just walk in and get pasta/sandwiches/salads at JoSiTo
Don't forget climbers garden, and there's another campsite up near there too.