The Bar/Lounge at Hotel Sebastian
Hotel Sebastian's bar/lounge is referenced by professional travelers. Out of 3 reviews that we tracked, 2 referenced the bar/lounge, like Lonely Planet and Fodor's.
Hotel Sebastian 
Lonely Planet
Fodor's
Lonely Planet "There is a cozy bar with a fireplace"
Fodor's "The Café and Bar de Antaño is open from 3 to 11 daily for coffee, snacks, and cocktails"
