Try getting a quote from Get Transfers - I have used this website for many different trips in various locations and been very good. I have booked the trip from Venice to Porto corsini for 4 persons …. You will get several quotes but hold on for a day or so before booking to see if you can get a good price…. I am paying £192 for a highly rated driver . You get their phone number and car reg at time of booking, so you know you are getting into the right car.
hope this helps