Hopefully this link works, if not, Scoop homes and art had a interesting article on granny flats, spring 2013.
http://www.scoop.com.au/Magazines/Scoop-Homes-and-Art/Spring-2013/38/73
There is a new one bed granny flat advertised on Realestate.com.au in Ashfield for $300/wk and front home is...