At $135pw rent and $2650 in outgoings, thats 36% of gross rent eaten up.
At quick sums, gross rent $7250pa - $2650 outs - $558 pa mgmt fee at 7.7% - $300pa LL insurance - $3825 @ 4.5% IO loan repayment = -$83 pa.
I fail to see how this is a nice little money earner?