Gian Mastrorosa
Google
One of the best places to eat I've been in Sao Paulo. Cozy, nice ambiance, very simple but characteristic. We arrived early (19PM) while the doors opened and afterwards it was packed, so I suggest you book your time through their Instagram.
We ordered almost the entire menu and failed to find anything bad. The grilled and fried stuff were all superb. The yakisoba was also surprisingly good (we ordered 2 for the table). My favourite dish was the Buta no Cheese, with the sour/spiciness of the sauce contrasting well with the pork. The only plate I've eaten in a better state elsewhere is the Bulgogui. The service was great as well. The only letdown was the price, it was likely the most expensive bar-like place I went in a while, but it's totally worth at least once in a lifetime.