Have you seen the movie "Under the Tuscan Sun"? That's how I came to learn about Positano. After watching it, I was mesmerized and told my DH that I had to go there one day. The apartment in the movie is actually a hotel (Hotel California), and we stayed there. It has an incredible view, about half way up, so not bad. It's almost exactly across the street from a fairly new outdoor bar called Francos, with the magnificent view. We had a drink there each evening before dinner.
We took the train from Rome to Salerno. You catch the ferry, a 10 minute walk from the train station, and it takes 90 minutes by ferry to Positano. You see the gorgeous Amalfi Coast from the sea...a highlight for us!
Watch the movie and you'll be reserving your hotel room!