I went to Norn Iron once. Well, Belfast Airport for an hour to get connecting flight to somewhere else. It was alright.
I once spent some time in Northern Ireland. About the first 21 years of my life actually. It's a weird place, you probably shouldn't go there.
I've been to Belfast. Was around 20 years ago. Found the people there to be lovely and hospitable. Too much red white and blue kerb stones for my liking though.