O Sole Mio was established in 1954 in San Francisco. They were known across the city as the romantic restaurant for couples and, despite the move to Millbrae, still maintain that accolade. That romantic restaurant vibe did not only come from their restaurants ambiance, but also their delectable food. According to many Yelp reviewers, O Sole Mio offers the best Italian food in Millbrae for an extremely affordable price. The only downside to this restaurant is that it is almost always packed and tends to get loud, but that is what you get when this many people love this restaurant.