I'd recommend Hardwood too, especially as it's next door to the Bierhaus. For relatively cheap & cheerful food, the Cornstore (on the Coal Quay) and Market Lane (Oliver Plunkett St) are good. If you feel like splashing out, I love Augustine's in the Clarion Hotel, and The Ivory Tower on Oliver Plunkett St. (not recommended if you like plain food, very unusual menu to match the strange surroundings!).
Also, Greene's on MacCurtain Street does a good early bird menu, and it's within striking distance of the Abbott Ale House if you can convince the missus.
Edited to say that I just realised you probably spent this weekend in Cork, meaning my recommendations are useless, sorry!