Any good QS company should be able to guarantee you at least double your cost to do the report in depreciation deductions.  Even though the house is old you would be surprised at the amount of deductions that are available, eg. Lino on a floor, 1/2 the cost of the fencing to boundary etc etc…  I recently used a company in Perth called Dep-pro. Their fee's are much lower than this but the fee is not an indicator of the best price. I've used them three times and service / report is excellent.  Worth doing.
If you decide to go there call and ask for Colleen she's the ops manager. Tell her you got a referral from existing client.
Good luck, hope it goes well.