Have been to Gustoso several times now and make a visit a feature of our holidays now.
Have always found the food of excellent quality and have never had a bad or sub standard meal. Portions are large and as someone else said, you don't need a starter and the garlic bread ( which I'm not normally a fan of ) if very good indeed.
I have always been of the opinion that, if the locals use a place then it must be worth a visit.
Plenty of locals to be found here!