Nice! Funny, I've never been to southern Italy in my trips there, I'll be in Verona for the Jets game and Limone for Titans game.
Two years ago I watched a game on my phone at a restaurant (and scared the locals with my random cheers), last year I watched the Jags game in Venice and I've watched SEVERAL games at the Red Garter in Florence (last year it was the Phins game, great atmosphere, love that place for NFL games).
Good luck, best bet is to ask around or get ready to find a bootleg feed on your phone!