During the time I've been in Sao Paulo, I've always been keeping an eye out for burger restaurants…read morethat know how to make burgers with the right level of quality, and I think St. Louis has what it takes to make a burger that tastes truly good.
Their burgers are juicy, and are made with good quality meat. They're properly seasoned too. St. Louis also completely gets the most essential element of the burger quality equation: they cook the burgers to your exact specification. I asked for mine rare, and that's exactly how they served it; my friend asked for well done, and they did that too :-)
Extra points for their house mayonnaise - it's fresh, delicious, and herbed just the way good mayo should be.
Last visit, my friend and I shared a strangely delicious dessert - the Bacon Sundae. Having been exposed to this different but tasty treat, I'm definitely going to have to try to duplicate it at home.
Over and above the burgers, the ambiance and the vibe are good, and the staff is friendly and helpful. About the only thing I don't like about St. Louis are their chips - they're humdrum, and horribly average. Even when I had them in a "Half and Half" (half onion rings and half chips - known elsewhere as 'frings'), the quantity and quality of the chips was sadly lacking.
Bottom line: Looking squarely at their burgers, St. Louis does it right, and I'll definitely be back.