With this kind of service you will have an English Speaking driver who will pick you up from your hotel/accommodation in Rome or at the airport of Rome on arrival.
After meet and greet, he will carry your bags on board of his van and off towards Florence.
About after 1.5 hour drive from Rome, you will stop for 2 hours in the enchanting town of Orvieto. You will have the chance to explore its little streets, shop a little and also visit the magestic Basilica that tops the highest part of the city.
Your driver will meet you again and he will drive you towards your final destination: your accommodation in Florence.