Dublin is fabulous. I'm from there, but moved abroad 10 years ago.
Observations:
Healthcare is a weird hybrid of NHS and private. Expect to pay for GP etc.
Schools are great, broadly Catholic and single sex (or maybe that has changed?) with high standards for the most part. Private school is relatively cheap compared to the UK and definitely worth looking into. There is less hand-wringing about private in Ireland than in the UK.
Property is still pretty mental. If I was moving back, I would be thinking around Rathmines - walking distance from city centre, nice town centre in itself, or a DART-line suburb like Dalkey. However, there are beautiful houses in the north city centre, and Drumcondra (the bit near town) has a lot to recommend it.
Eating out is EYEWATERINGLY expensive. OMG. Drinking less so.
Traffic is bad. Hopefully the new Luas routes will help.
Everybody is lovely. I was back for a weekend recently after not being back for a year or so and it really hit me how staff in shops/cafes/bars are so much bloody NICER than in my experience of the SE and London here in England.
There is so much variety in what to do and as it is a relatively small city you can get EVERYWHERE. It's not like in London where your heart sinks when you check a distance on CityMapper.
It's so BEAUTIFUL. The grandeur of the city centre is disproportionate to its size, and is obv. because of how the city developed and the attitudes held by the Anglo Irish aristocracy, who wanted to make Dublin a major European capital, not a booby prize. When you think about it, Leinster House (among much other Dublin architecture) is ridiculously OTT, and that's what makes Dublin so great.