BTW, this newsboard has a pretty good Search box, top left in blue. Easier than paging through recent posts. Even has a filter (after the search) for 1 year, 2 year old, etc.
Rick's "Worthwhile splurge" is the Ambasciatori Grande, which we liked but expensive for this newsboard. You need to study the layout of the town to learn which hotels are near the elevator down to the marinas. Check ferry schedules before you imagine using a ferry every day. I'll also say we had some ferry horn noise in our cliff-front luxury room.
I'd expect a big difference between September and November. Fewer ferries, stormy water cancellations, a few places closed for the season. But regarding Sorrento, there is sustained demand from places like the U.K. May-September books up fully at least six months in advance.
Edit: Always look up the exact location of a Sorrento hotel you consider, just so you know what you're getting. There are sea views from far away, even up the huge hill where the Tour Bus hotels are, with shuttles to downtown. The five luxury hotels right on the Gulf cliff generally have a private boardwalk (not "floating") sea bathing platform with a bar, reached inside the cliff, from the hotel's main elevator. Sorrento has only one tiny public beach, placed between the two marinas, for maximum diesel aroma.
I will say that the Ambasciatori's business model has house-only rebates from the internet pricing, rather than discounts. So we had an in-house dinner (perfectly good) that we might not otherwise have ordered. We usually had a nice walk downtown, by the Passeggiata, and looked for a restaurant.
It was convenient to charge our 8-hour day with Mercedes sedan and driver, on the Amalfi Coast, to our room bill. That's how we paid for the final transfer to Naples, as well.