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Natrix natrix
This one is probably a juvenile, is no more then 40cm long and the colors are really bright. The colors are dark green, brown or even grey, with a distinctive yellow or sometimes almost white collar around the neck, the belly is always whitish. Females are longer than males. They can reach 1m length and rarely almost 2m.
This one, around 1600m altitude, on the Mt. Galero grassy slopes. They are common from river banks to mountain slopes.
In my country (Romania) their common name translate word to word is "home snake"... Mice is part of their diet, and in some communities they are considered helpful...
I'm sure that's a Natrix natrix, but I don't know if it's the same http://www.projectnoah.org/spottings/820...
I can't help you with the ID but I must say that this snake is a beauty! Thanks for sharing it :)
I'm no Italian herp expert but my best guess is with what you came up with - Natrix natrix.