It isn't too bad really, it is very calm and pretty quiet in Queens Park, last time I ever heard of some random crime here was in the last 2 months, (a break-in on our own car). I'm sure there is more to come but, it is a pretty average and safe place as long as you don't forget to lock your doors, you are fine, just watch out for teenagers, they are the main threat for crime and things in Queens Park.
I live in Vic Park and it's safe - You just have to be vigilant in locking doors and ensuring security is in place, like any suburb in Perth. There HAVE been break in's around Vic Park, but never us. There are loads of familes in our street - and surrounding streets. I cant comment on Queens Park though. I do think Vic Park has got better from it's bad reputation years ago - if I could afford to buy in Vic Park I would.