[modicasa]

If you're talking about someone (s) to go into buying a property with you and divvying up between yourselves as to when and how you take advantage of it - that is a direct way to end unhappily.
Under Italian law you would be equal owners with equal rights and obligations. You would need a separate agreement to divvy up time periods, again by a notary. Should one of you want to sell there is no preemption right for the others, you own a quota of a building so may never sell. Your only option for rental would be short term lets - unless all the owners decide to rent on a transitory contract for up to 18months. Rents in that area are low, so you wouldnt really make any money. If its to restore then who pays what and who chooses the builder etc. In my experience shared purchases, even within families, do not end well. If you can afford to go it alone, then do so - at least the property would be yours to do what you like with.