You want an Irish pub in Dublin? Go to The lower deck. The solldiers from Cathal Brugha barracks go there as well and locals watch the rugby games. A pint is 4€. I think there is not much to say, It has a great and friendly athmosphere.
It is located in Rathmines, Portobello Harbour 1, Dblin 8. Buses going there are 128, 83 and 15.
dana