I've not been to its namesake on top of the Hilton but I imagine they couldn't be more different. Located in a shopping arcade (!) the Galaxy is an old-school bar that doesn't feel like it's changed since the 60s. Pictures of Kerouac, Balzac, Jack London and Beethoven behind the bar. Dapper barman serving seasoned drinkers.
Stadiou 10 (in shopping arcade)
210 322 7733
Nearest metro: Syntagma