This achingly hip, underground speakeasy ticks all the boxes: no identifiable name or signage outside; a black door smothered in keyhole plates; and Prohibition-era decor including chesterfield sofas, dim lighting and a craft cocktail menu. Not sure what to order? The mixologists will create your own bespoke cocktail (around €10).
No password is required to get into Keyhole, but you need to fill in a form to become a member (€5). No phones.