Hi Hakanh,
I think you should have a look to this topic
www.seabreeze.com.au/forums/topic.asp?TOPIC_ID=40393i posted it when I came in Australia and since then I met some guys and we had some really good sessions.
Also I'm sharing a huge house in Surry Hills with 17 student and young workers. Very honestly it's not the more quiet or clean place you'll find but it's certainly the funniest and the best located one (1 min to Central station and so many pubs around). There are people moving in and out every week so if you are interested let me know.
Cheers