I definitely recommend booking with ItalyTours.eu!
We just returned from a 12 night Med cruise. I booked 2 tours with Italytours.eu - a tour to Mt Etna and Taormina and the Amalfi coast from the port of Naples. A few weeks before we sailed, Celebrity changed our port from Messina to Palermo. I contacted ItalyTours and they rescheduled us to Palermo. We then ended up missing the Palermo port due to weather. We exchanged emails and I was reimbursed promptly.
At our Naples stop, Vinny was waiting for us at the gate. He was fun to be with and an excellent driver - which you definitely want driving the narrow road connecting the villages of Positano, Amalfi and Ravello. It was a full day, and time was made for a sea side lunch under vines of lemon trees. Compared to other offerings this tour was very reasonably priced. The van was comfortable, but not a new luxury vehicle, so if this is important to you, you may want to ask about it before booking.