Can an international PhD Student in Australia make a living with an APA scholarship and 8 hours teaching work per week? My "problem":

I am from Austria and currently in the process of applying for a PhD position in Brisbane, Australia. My supervisors said that I might be eligible for an 
APA (Australian Postgraduate Awards) stipend which is supposed to cover my living expenses in AUS. Receiving this scholarship would also mean that I wouldn't be paying any tuition fees.
The total stipend amount is 26,288 AU$ / year. And as far as I know, I would be allowed to work up to 8 hours a week to earn some extra money (I.e. as a teaching assitant).
I don't know how much the hourly rates for this type of job are, but if I speculate and say it's about 20AUS$/h, this would result in a total weekly budget of approximately 660AU$ (including wage and scholarship).

My question:

Can I make a living with this amount of money in an expensive city like Brisbane? Could I maybe even safe up some money to fly back to Europe once a year to visit my family and friends?
Any experiences or useful links of (international) PhD Students in Australia are appreciated (I.e. on insurance costs, etc.).

Note: I know that the Australian Government says that the average living expenses per year are AU$18,610, but they don't explicitly state how they calculate this sum. When I checked the costs for housing, food, insurance, etc., the sum exceeded this official number by far.
I'm a current PhD student at the University of Melbourne. I can just support myself and one other person on my $30,000 of scholarships. I also live with just my partner (no housemates), our rent is just under $400/week + bills. So if you are OK with a more student-like experience you are likely to be fine, and use TA work to save for flights you need to take back to Europe.

Your estimate is quite low for TA work: the minimum wage for casual cafe or fast-food workers in Australia is over $22/hr. I get $44/hr for TAing, though this may just be Melbourne Uni. Also scholarships are tax-free, meaning you may not have to pay any income tax (as it would be nearly impossible to earn over the $18200 tax-free threshold given visa restrictions).