Sheera G.
Yelp
I'm not ashamed to tell you that I ate at Hivaoa not once, not twice, but three times during my week-long stay in Porto Cervo. Sardinia is so beautiful and Hivaoa offers unpretentious, delicious Italian food, at a really good value for money given the area.
Night one I ordered a three course tasting menu for 22 EUR plus wine. Course 1 was mini Sardinian octopus in a diavlo sauce, a little strange, but I was feeling adventurous. Course 2 was a super-fresh spaghetti with seafood and clams: fantastic! Finally for course 3 I had grilled calamari, also excellent.
Night two I came with a group and tried the fish polpette di pesce (yum, ~6 EUR) and a pizza (~9 EUR).
Night three I had an insalata mista and Sardinian pasta with tuna, pesto, and tomato, also really tasty.
This place was buzzing was families early in the evening, and then turned to a more lounge-like atmosphere later in the night. 
It's always nice to find a local spot and be greeted by a loud "ciao, buona serra!" when the owner recognizes you walking down the street.