Sometimes it is not where you live but how you live. Think logically, if you are a tourist and you go around with cameras hanging around your neck and it screams tourist there is a good chance that you will be spotted and picked upon. I think that Heathfield is a decent enough area although I do not live in it myself but I do live in Finglas. And furthermore you have lots of great facilites up that way including IKEA, Charelstown Shopping Centre and great connections to the M50 and City. And as far as I would be concerned that if you are going to live somewhere then look after yourself whether it is classed as a good, bad, rough, kind, pleasant neighbourhood because the badness travels it is not necessarily in the one spot. Best of Luck!