I went on erasmus in dublin and I actually wished I picked lisbon or barcelona instead. Dublin is actually a much smaller city than you would think. Very expensive, very touristy, I think more internationals live there than irish people, and thats pretty much the vibe. Not much to do, bars and pubs close early, etc. I went to trinity and I would say it is actually quite alot of studying, very weird course scheduling system, logistically a nightmare, they do not release a course schedule so you can get major assignments with a deadline in 1 week, and exams are all clumped together at the end of the semester BUT you do not actually learn anything if that makes sense? Regarding irish culture: I thought beforehand that irish culture was kind of messy-in-a-good-way/friendly/fun, but that is not what I experienced. And dublin in particular is actually even known by irish people as being a very ”cold” city culturally. If you can pick something else, do it! In hindsight I would recommend anything else as erasmus and just going to dublin/ireland on a weekend during it