When we stayed in Sorrento (a lower-end destination than Ravello, in general), we used our hotel's land arrangement partner. It seemed like they would have a big incentive to please the hotel's customers. We needed an 8 hour trip surveying the Amalfi Coast from our hotel. The hotel made and confirmed our trip, and it was charged to our hotel bill. We did the same for our transfer back to the Naples rail station. That second transfer was 90 Euros some years ago. I think it's closer to 130 or 140 today. I think you will find Paestum to Ravello to be very expensive.