Oh lucky you, I had to move in the opposite direction as the rents where too high, Mount Argus is a lovely area, very quiet and settled. Its a nice walk into town and you have Rathmines and Harolds Cross a short walk away.
You also have a superquinn over at sundrive, which is expensive so be aware and a few little shops over there too.
However sundrive also has a fair few knackers hanging around mostly groups of lads who think they are all that and wanna be gangsters cause their from crumlin (which is sundrive) if you ignore them its fine.
Occasionally these gangs have come into mount argus when I was there but a call to the guards who come down promptly and they are gone.
If you have to get the bus then the 54a stops just at the church which brings you back to tallaght if you need to or in the opposite direction into town, and the 18 you get over at sundrive which brings you to rathmines and on to sandymount or out to ballyfermot should you need to get there, but you better off timing that one as its a bit hit and miss.
Your going to have a fab time there, best of luck and i'm green with envy