Everyone queues for the famous three. The houses in this country are empty, and they are where the argument actually is.
Monday is the closing day here, not Tuesday, and the small foundations close a second day of their own choosing without announcing which. Ring on the morning; the telephone is answered and the website is not.
Milan and Venice are two and a half hours apart by fast train, and both of these pairs of houses are walkable once you arrive. Florence is a further ninety minutes south and does not need to be a separate trip.
Winter is the correct season in all four cities. February in Venice is cold, half-lit and entirely yours; August is unbearable and I have never once been rewarded for trying.