I have stayed at many airbnbs and this must be among the best. I stayed for two weeks and it had everything I needed.
It has a well-equipped kitchen (even a Nespresso machine/milk frother!), a comfortable bed, reliable internet (with a Chromecast to stream), a washing machine/dryer, a decent bathroom, a courtyard where I could park a bike, and a supermarket nearby.
It is very close to the bike path which goes all the way around the Swan river so it was very safe to cycle to the city (or to the UWA campus). The paths in the park next to the river make a nice spot for jogging as well.
I would highly recommend this place to anyone staying in Perth and I hope that this place will again be available when I come back!