The Lucky Cat Café is the name of the café that is owned by Aunt Cass. It is also the place where she, along with Hiro, Tadashi (until his death), Baymax and Mochi reside.
The cafe is open for business every day. However, it was closed on one occasion during the dark hours when the family was mourning the death of Tadashi, who lost his life in an explosion at the San Fransokyo Institute of Technology.
The cafe is also where Aunt Cass does her "stress eating" after picking up Tadashi and Hiro from the police station after the bot fights.
While the café is downstairs, Aunt Cass, Hiro, Baymax, Tadashi, and Mochi live in the upstairs apartment.