Of course you cannot guarantee "nice" (whatever that means - different things to different people most likely) kids/people in any location at all. But to claim that it's a tall order specifically in Dublin is a facile and objectionable comment.
That's roughly it, although all the roads behind Fausaugh Road (St Attracta Road, St Jarlath Road etc) and Annamoe (behind Cabra Road) are in old/east Cabra.
Would totally recommend (Old) Cabra, but then again, I'm 100% biased having lived there for the first 30 years of my life. It's quiet, has good transport, schools, shops and less than 30 mins walk to O'Connell Bridge.