7 days in Italy
Two cities. Rome and Florence. Six nights: four in Rome and two in Florence. One intercity transfer between them, an hour and a half, in the middle of the week.
Rome takes four because it is really three cities layered on one another — ancient, baroque and Vatican — and because it is large enough that crossing it is itself an event. Florence takes the squeeze because it is small and walkable enough to survive it: two nights there is one full day, which is a thin but real visit in a way that two nights in Rome is not.
The variation worth making: Rome and Venice, if Venice is the thing you have always wanted to see. It is a longer train and the two cities have nothing in common, which is either the appeal or the problem depending on the traveller.
The mistake to avoid is Venice, Florence and Rome in seven days. It is sold constantly, and the arithmetic is what rules it out: six nights divided across three bases leaves roughly two nights in each and requires two intercity transfers, on top of the arrival and departure days. Nothing is left that is not partly logistics. The same three cities in ten days is one of the best trips in Europe. In seven it is a schedule.
