Good for you may be different for others depending on what you're into.
Also Dublin can be a little odd with "enclaves" of really nice houses in areas that wouldn't be classed as "good".
Donnybrook might suit you or Rathgar or Sandymount. Sandymount is handy as it has the DART whereas with the others it's the Bus or a walk into town.
Ranelagh has some really nice parts but it also has a student vibe in parts but it's very handy for the city centre (or "town" as we call it) has some nice places to eat and drink and you also have the Luas light rail system.
I like Stoneybatter on the Northside, was partially gentrified over the past decade very handy for town and some nice refurbished houses.
Further afield - Howth, Malahide are nice but too far from town for you on the Northside, Clontarf and Glasnevin are nearer to town but nice areas too.
Southside, Terenure has some nice houses, Bushy Park and good restaurants in the village. Blackrock, Monkstown and Dalkey are very nice too with good villages and the DART for easy access to town though Dalkey is probably a bit far out for you.