The Cobblestone pub in Smithfield is special because it feels a bit like stepping back in time. Or, at least, into a pub in West Clare. It’s a bit run down. On an evening, you might find three sessions going on in different corners of the place. The atmosphere is perfect. The Cobblestone is on a corner at the top of Smithfield market in Dublin. The buildings and land on either side of it are derelict. The pub occupies the ground floor of a three story building.  Across the road from it on Smithfield Market is a wall of apartment…