What can I say about Dublin.
Everything will be more expensive
.
If you want general living tips. I moved to Rathmines / Christchurch area simply because it was close to the city and transport. Living along the Luis Line will help.
I don't have / need a car at the moment which saves me money.
Rent is damn expensive (infact ridiculous) if you ask me. Makes me want to go back home to Australia at times.
I save money on food each week by going to the Meath Street market and buying fruit / veg / meat down there. I'm sure there are other markets.
I'm gonna stick my neck out a bit and say that living in the South is nicer than the North (yeah I know South Vs North) but I find the South is prettier and less troublesome.
All I can think of for now.