The Star Alliance Lounge Sao Paulo is located in Terminal 3 of Sao Paulo-Guarulhos International Airport. I accessed it twice through premium flights out of the Sao Paulo airport.
The lounge area is fairly large. It did get pretty crowded when I was there, but it’s not too hard to get some seating, unless you have a group of ten or something. They have various separate seating areas, e.g. lounge seating if you’re trying to elevate your legs for a bit, work seating, if you’re trying to get some work done, or more group/dining seating, so sofas and dining tables with chairs.
The food and drink selection is ample, although I wouldn’t say it’s insanely awesome. It’s pretty much a good offering with some hot options, and it probably can fill you up if you get multiple helpings. I wouldn’t write home about it, but I was also happy that there was food.
They had a few wines, but it also didn’t look that impressive. Overall, this is a very solid lounge.