The apartment tettofiorito is perfectly located. With the Circumvesuviana you can reach all the important sights from Sorrento, Pompeii, Ercolano to Naples. The station is only a 3 minute walk away. Although the apartment is situated directly in the center of Castellammare, it is amazingly quiet. From the rooftop you have a nice view on the Monte Faito. Unfortunately the Funicolare did not work when we were there, and I have read that it did not work either in 2013. By car it is at least a 1 hour ride up there.
Antonello, our host, was really nice and helpful. He gave us useful tipps and whenever we met him, he was asking us if everything was fine. Once he even brought us ice cream. That was very much appreciated! Besides his English was really good, we had absolutely no communication problems.
The apartment is declared „Bed & Breakfast“, so the basics for breakfast were already there.
We were a bit surprised how densely populated this region around the Vesuvio is, actually we were expecting a dreamy little town when coming to Castellammare. But that is definitely not the case, so be prepared for lots of (Italian-like) traffic, scooters and people. If you really want some silence you have to climb up the mountains. The higher you get, the less people there are.
Being Germans we were also shocked by all the garbage lying around in the street. But of course, this is a well-known problem. A must see are the Villa San Marco and Villa Ariana, both excavations of Roman Villae in Castellammare. Free entry and very well preserved!