Prices? Painful to say the least, even for Perth.
This one sold a few years back (2012) for about $800,000 if the online listings are correct.
Not sure if its an average of bigger-than-average house for the Kardinya area, although our five bedroom monstrosity that we sold in 2010 was too big for the suburb and was therefore overpriced for the area. Had it been one or two over, things would be VERY different.
I couldn't tell you what it would be worth today, or what other houses are listed at, because I haven't bothered to look(!). Perhaps I'll get back to you on that at a saner hour.
Kardinya would probably fall into Middle or Upper-Middle by my reasoning.
These days, compared to the outer suburbs, its very close to the city, shopping centres (esp. Garden City in Booragoon), beach and port area, parks, comprehensive public transit (two railway lines and a about 6 bus routes minimum) and that sort of thing.
Doesn't seem to be a lot of "undesirable types," but perhaps I just haven't driven enough round those parts.
Close to a private High School & University, as well as two smaller independent-style schools (One Waldorf and one Montessori).
This part of the city seems to be quite nice for the most part. That said, go much further south and you hit the older suburbs (South-Lake, Yangebup, Hamilton Hill etc which are cheap and filled with a lot of government-owned housing, and (unfortunately) the types that give those really in need a bad name.
Bibra Lake, North Lake, Leeming and Jandakot surround the former two and are mostly more middle-class.
Bibra Lake is something of a misnomer, as much of it was man-made as a rubbish tip as late as the 1980s. Thankfully that ceased with the construction of the original area to the East and South-East of the lake. And that said, its far more of a lake than North Lake, which is simply a swampy/march Bullrush field these days and I'm wondering whether its had a lick of water in it since leaving the area previously in 2010.
All in all, its a great area, spare the busiest General Aviation airport in Australia (Jandakot) buzzing us - but that said, we choose to live here, and that airport hosts international visitors from China (and perhaps others) at the aviation school. Good for local industries.