I used Transferelax services for the transfer from Naples airport to Sorrento, then I used it to visit Positano, Amalfi and Ravello by car and finally I did the transfer back to Naples with a stop in Pompeii. New, clean cars and highly trained drivers.
Everything was wonderful, punctuality, knowledge of the roads, avoiding critical traffic times, fair price and trust in the professionals.
I highly recommend Giuseppe's team, if you want peace of mind, hire his services.