I was in Italy for a month in May w/many posts on my blog philatravelgirl -it's a good time of year. Check dates for venice as Vogalonga race weekend made it hard to find room (I have great Venice flat rental suggestion!) Venice is my favorite city so I'm partial to more time there - I even learned to row a gondola out to the lagoon this trip.

For the Amalfi Coast, I used a private guide for two days for a photo safari as I've been before and wouldn't even attempt to drive it. While others say to skip AC I combined with the Island of Capri which I'd recommend to see Blue Grotto - it's a lovely island IMO - quiet and relaxing.

For Florence, if not museum folks then think you don't need that much time. I did a fun little Fiat500 tour of city and suburbs, a food tour and wandering in three days.

For luxury Tuscany look at new Rosewood property.

DM with any queries