I stayed Villaggio Turistico Costa Alta due to my original accommodation falling through at the last minute. It wasn't the kind of place I'd generally choose to say, which makes reviewing it quite tricky to be impartial.
First, the location. Piano di Sorrento is a lovely little village, surprisingly full of high-quality reasonably-priced restaurants within walking distance. Careful on those roads though! Public transport is good via the Circumvesuviana train, however, the buses were unusable (they get full in Sorrento and then either drive past or miss out Piano di Sorrento entirely). The resort has a nice view from the tops of the cliffs if you sit where the wooden benches are (watch out for mosquitoes).
We spent 4 nights in the stone-built cottage, and one night in what I can only describe as a caravan with wheels. The stone-built cottage was good, although nowhere to sit inside (two bedrooms, small kitchen and bathroom). There is a seating area outside, but this seems to be a popular resort for large groups of young Germans who like to party outside their accommodation which isn't separated from your own. The "caravan" accommodation was much poorer, and any noise bleeds straight through badly.
We only permitted a breakfast on one morning for some reason, which was just as well as it seemed to consist of a bread bun, some jam and coffee.
The staff were fantastic, so friendly and welcoming and accommodationg. 3.5/5