The transfer worked out very well! Our driver was waiting for us at the end of the platform at the train station and grabbed some of our luggage in the walk to the van. The trip was pleasant, and when we arrived in Sorrento at our Airbnb, he waited with us to make sure we could get into our apartment, even calling our host for us when we weren't able to get a hold of him. A private transfer was so much easier than taking the commuter train. I would highly recommend it, especially if you have 4 people.