There is a group of 15-20 of us that will be visiting Italy. Is there a way to get a driver and small bus for our group for pick up at the airport, and to take us from Rome, to Siena, to Volterra, Pisa, Florence, then, Venice, and back to the airport our last day? If so, what are some suggestions for bus companies? Thank you.
For once this may be a time where a travel agent would be useful. You are looking for a charter bus for an extended period of time. I would contact RomaCabs - they have a website - explain your needs and see what they respond. They could a recommendation. You might contact the Rick Steves' office because they contract with bus companies all over Europe. Good luck
You can try starting with this site. They will send the info out to their network and they will email you quotes. Then you can fine tune.
http://www.limousine-center.com/coach/rome/
There are a number of Italian charter bus services that you can find through Google. For northern Italy, our tours use www.alterinibus.com, based in Florence. I'm also rather partial to http://terrenzio.it/, based in Rome, on the basis of them probably being related to me.