Gruel! or Mermaid. They're actually just next to each other, and both equally awesome.
Oliver St. John Gogarty's
Live traditional Irish music every day 2:30pm until late in the first floor bar (ground floor has more modern music)!
I often take my visiting friends to the restaurant on top of Marks & Spencer. The food is excellent and the prices are more than reasonable.
Good unfussy Italian food at reasonable prices, at The Italian Connection, Talbot Street