We are arriving in beautiful Florence in May at about 9:30AM on a Saturday. We have booked a rental car in Siena which we need to pick up before 1PM when they close. We chose to have the rental from Siena as my husband doesn't want to drive out of Florence. Here's my dilemma. I am in a wheelchair and don't know which is the best wheelchair accessible means of transportation to Siena. I believe hiring drivers would be very expensive and that taxis would cost over $100. I emailed Turismo Senza Barriere twice but never received a reply. Would the airport shuttle bus be accessible. Same question for the quick Florence to Siena bus. Any advise would be greatly appreciated.