Hey Lunchy, one of my housemates is over in the States at the moment, so we actually have a temporarily spare room in our house for the next couple of weeks (I think she comes back on the 30th). She'd probably be open to the idea of sub-letting it for a very small amount of money. Alternatively, if you can't spare the cash, we also have plenty of couches, and I can ask my other housemates if they'd mind you staying for a few days. I share with another guy and two girls, by the way.
Also, if you'd prefer to stay with other Sydney-ites who you've met more than once, I'd completely understand!
Also also, finding apartments in Sydney is kinda difficult at the moment, though you guys probably already know this. Good luck!
-Nick