Time to start booking

Filled in the web form to book my preferred Rome B&B. Also emailed Hotel C in Florence to ask about availability. Slightly concerned that I effectively have the same time in Rome as in Florence – the more I read about Rome the bigger it seems. But I’m assuming, perhaps wrongly, that Florence will be visually more appealing. I can arrive there later in the day to give me another half day in Bologna, and leave reasonably promptly to have an extra afternoon in Rome – so an evening and three days in Florence, an afternoon and three days in Rome plus whatever is left over from the day in Palestrina.