Is 7 days enough for Rome, Florence and Venice?

It's possible and it's the single most over-packed itinerary Americans arrive with. Seven days across three cities means two travel days, leaving you roughly three in Rome, one and a half in Florence and one in Venice — enough to photograph the big sights and almost nothing else. If the flights are already booked, do it and enjoy it, but weight the days: Rome needs three full days minimum, Florence works beautifully in a day and a half, Venice is magic for one night and a morning. If you can still change it, drop Venice and put the days into Rome and a countryside stop.