Working Holiday Suggestions?

I'm am an American student about to graduate university and I was hoping to plan a working holiday trip to Ireland. I know little to nothing and was hoping to be pointed in the right direction. Do you have any recommendations on where young people tend to thrive in Ireland? I am drawn to diversity, good food, good music and art, and a friendly culture. I was thinking Cork, Dublin, or Limerick, but I am open to anything. If you have any resources to learn more, or people to reach out to, I'd greatly appreciate it. I would love to get a job and extend my stay as long as possible, any tips on that would also be great. Thank you!