Lebovitz's blog is often deservedly recommended here as a source of recommendations, but this review gets into the much debated questions of "is the availability of English-language menus a sign of a bad restaurant?" and "are only restaurants which appear to have a majority native-born-resident clientele any good?". His opinion is that if either of these rules ever was true in the past, they aren't any more.
Personally I see more and more restaurants are providing English-language menus, thanks to demand and greater language skills. But I agree with the commenter who points out that it's still easy to see an extremely tourist-focussed restaurant, and that such are often poor.