O'Malley's

O'Malley's is a bar somewhere on Cybertron. Presumably, it has pretty comfortable stools, which might explain its lasting popularity.

Classics
After the war, Mirage joined his friends in visits to O'Malley's in order to get back his old life. He found himself with nothing to say to them. They found themselves with nothing to say to him. Mirage tended to escape the uncomfortable silence by turning invisible and sneaking away.

Dawn of Future's Past
While preparing for an exploration mission that would end up as the Beast Wars, Rattrap mentioned he would rather be hanging out at O'Malley's.