Best italian in Dublin, in my opinion.Very informal and all the staff are italian. You can get take away by the slice or sit in. Unfortunately they have very few tables. (pasta Fresca next door isn't at good)
If you're a bit further out then Bits and Pizzas in dun laoghaire and Dante in Blackrock are great for take-away.
They are both sit-down places but why pay 5 euros for a beer to sit in when you can eat your pizza at home and get your beer for a euro a bottle from the off-license ?!