To the people reading this: the customer got a full refund, never showed up to collect the tickets, but still get to leave a negative review.
Having said that, you can litterally read on the product page as follows:
"Departure Point
Motoscafisti Capri, Molo Numero 0 Porto di Capri, 80073 Marina Grande NA, Italy DOCK N. 0, PORT OF CAPRI, MARINA GRANDE"
...with the hope for Viator to just cancel this review.