What style are you after OP? Always best to find an artist whose work you like. True Electric on Wicklow Street is excellent for traditional stuff and they're really sound laid-back people.
I've been to Dublin Ink, True Electric, Colour Works and The Ink factory 😂 I go to different ones depending on what style I'm looking for and what I want done! There all class in my opinion but again depends on what you want, hope this helps 👍🏻