My wife and I visited Sorrento in October 2012 and discovered this bar through various websites and previous favourable reviews.
We weren't disappointed.
The bar has a lovely "local" feel to it and the barman (Luigi) is very obliging in describing his wines and certainly knows his stuff without being overbearing. We had excellent and perfectly reasonably priced (4 - 5 euros per glass) whites and reds with both being served in the right glass and at the right temperatures. Every drink is served with tasty little appetisers too.
The atmosphere is relaxed and the whole bar is timber lined which creates a warm romantic setting.
We didn't eat but we saw local people eating and the food looked excellent. It turns out that the foods comes from the restaurant next door (il Giardiniello) which is owned and ran by Luigis mother - perfect! Incidentally we visited the restaurant another time and it too was superb.
Without question this place is worth a visit.