I really like this supermarket and there are many of it in the city but this is the only one I know is 24h (except on Sunday nights). I'm crazy about their banana puff pastry and their pizza is amazing too. If you're gonna stay longer, like two weeks or more, I suggest you apply for their discounts card. You save some money with it.
R. Prudente de Morais, 49 - Ipanema, Rio de Janeiro - RJ, 22420-040, Brazil