hi,
If you are taking the Red Line and are coming from Connolly, I would get out at the Four Courts, cross the Liffey, go up Bridge Street, Cornmarket to Francis Street.
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Or, if coming from Tallaght, I would get out at St James' Hosiptal and go down St James' Street and Thomas Street to Francis Street.
It's not very handy either way :-(
Sorry, can't help you regards the restaurent query...
The Lord Edward is on Christchurch Place which is not too far away and has a good reputation- i've never been there myself..
I suppose Dame Street is a good option- about 5-10 mins walk from The Tivoli- Toscana or The Mermaid are nice places on Dame Street..