Well according to RPData's free stuff which comes from the ABS anyway:
Unfortunately I don't know what has happened to the population from 2006 - now. But you are right about it mostly being young people :D Which also aligns with over 60% of the people living there being renters.
I like...
Summer Hill, Enmore, Leichhardt, Stanmore, Lewisham, Petersham, Stanmore - all those places along the railway line should be fine and in high demand.
What conflicting stuff have you heard?