If Abacus easily took larger groups, I would give 5 stars. But, if you want to share a lovely time with 2-6 people it's ideal. Then I give Danny & Abacus 5 stars for sure! Ambience is lovely. Even eating al fresco in Callian works so well - and inside it's lovely. Service is attentive and very friendly.
Pricing is very reasonable for the quality, quantity and thought which goes into every dish. Not afraid to experiment, Abacus delivers some wonderful and often surprising taste and texture combinations. They all work! The menu changes regularly and the bias to local produce and wines is very well balanced. I have eaten there often and will continue to do so.
If you want standard "tourist fare", go elsewhere.
If you demand more for your money, give Abacus a try. I don't think you will regret it (or I wouldn't write this recommendation!)
This review is the subjective opinion of a TripAdvisor member and not of TripAdvisor LLC.