Tutti Italia is on holiday all month long in August. You might think that would make Rome relatively quiet, with every Roman gone to the beach, but it’s not; it’s unbearably busy and unbearably hot. July, too, is unbearably busy and hot; so is much of June. May and September used to be quieter, but lots of people realized that and now they are busy too. Winter can be a bit miserable, though Christmas is quite busy. So October, by default, becomes our month of choice to visit Rome, when it is less busy, still lovely and warm, and you can selfie at the Trevi Fountain in that magic late-summer sunlight without quite so many tourists ruining the view.