At just 30 square feet of public floorspace, not including the loos, Ron Black's Dawson Lounge on Dawson Street is Dublin's smallest pub. As you might expect, the atmosphere is very close, more like a friendly rush-hour tube1 carriage than a pub.
Astonishingly, given the pub's size, there is even live music on occasion. The last time our Researcher visited, a three-piece jazz band was playing. This left the patrons with about 15-square-feet of space.
The loos, as with most public toilets in Dublin, are best avoided.