The general area is very nice, glenmore has improved a lot in recent years. There were some dodgy people in whitechurch estate but i think that's calmed down a bit. It's a good few years since I lived in the area though.
If it were me I'd see if I could get into moyville instead. The plus points of the area are the access to both St Enda's Park & Marlay Park, not very far from numerous supermarkets - Nutgrove, Dundrum, Tallaght, Rathfarnham. Good secondary schools, Colaiste Éanna, Sancta Maria, Beaufort - don't know much about Knocklyon.
Bit of a walk to the 16/15 bus but the 61 goes from Whitechurch through Dundrum to town.