TOWERS!!! Actually, it really depends on the kind of person you are... There are generally 2 types of accomadation. Catered- where you have meals provided for you and Self Catered- where you cook for yourself. Generally the catered places are more social. "Diggings" is self catered and its known to be pretty quiet. The main social place is Towers- where i am now, there are 2 towers and its absolutely nuts! Very central to everything something is always happening there! The rooms are VERY small but most people seem to find that its just enough personal space. I think its quite cosy.
John Oxley Village (JOV) is similar to Towers although its a little more spread out and is on the other side of the uni which we towers people consider a hike, but its not really that far. The rooms are maybe a little bigger but the walls are made of fibro and you can hear EXACTLY what your neighbours are getting up to (wink wink nudge nudge)..
Windradyne is the newest place, the rooms are bigger but they really are detahed and kind of keep to themselves.
For 1st year i recommend JOV or Towers.. you can find more info at
http://www.csu.edu.au/enterprise/residences/