Sempervivum Tectorum

That would be wonderful, dear @Tapshanov, and thank you very much ...I'm leaving this Saturday and I'll be back in a week, so I hope I'll me able to snap lots of pics of plants, animals and places :)

As far as I know, in Greece we don't use it in any medicinal way...There are some myths about it's everlasting protection of the house (thunder protection) and family (love/care/good health), and I know for sure that some other Sempervivum species are protected by law, like the Semprevivum balsii, and lots of people cultivate those species, because "it's good to have it around", wich I find great :) In Epirus region, whenever they build a new house/structure, they always plant the top with some young Semprevivum plants...I'm leaving for Tzoumerka mt next week, and I might be able to bring photos and a couple of plants :D http://stalikez.info/fsm/semp/site/grece_gb.php

So it belongs to the Crassulaceae family (as the Aeoniums), and it's a Southern Europe native :) And check this: http://en.wikipedia.org/wiki/Sempervivum_tectorum#Folklore_and_herbalism

I think I found smthng, and guess what: I have the exact ID :) http://tenerifeislander.hubpages.com/hub/Tenerife-herbs-the-Canary-Islands-Houseleek-is-an-Aeonium-species

Aeonium, probably an hybrid between A. nobile x A. cuneatum (white form) http://www.xericworld.com/forums/attachment.php?attachmentid=654&stc=1&thumb=1&d=1280513594 https://es.m.wikipedia.org/wiki/Archivo:Aeonium_cuneatum_01.jpg