I visited Italy for the first time (why-oh-why did I wait so long) in October: basically Venice, Florence, CT and Milan. I loved Venice best.
I am thinking about going back in February to see the Carnival and more of Venice, combined with a visit to southern Italy, where I hope the weather will be somewhat better. On my list are: Rome, Pompeii, Ravenna (for the mosaics), Sicily, and possibly a detour to Malta.
My airport options are Rome and Milan. 3-4 hour flights and one hour time difference.
Just because the days will be getting longer (less short!), it seems better to start in Venice.
I love museums, Roman ruins, history, scenery. I will be travelling solo, budget-conscious, not interested in great restaurants (eat vegetarian).
Forum posters: what do you think? Pros, cons, itinerary, advice.... no more than 14 days.