In an act of kindness, Vim Vijaya offered the Perth family free accommodation after they told him their previous house had burned down.
Now the landlord has been left with a $30,000 damage bill.
The family left the house in a mess, with food, worms, blood and needles found amongst the rubbish left behind.
Professional cleaners have spent four days at the Kelmscott house, in Perth’s south-east, and there is still much more that needs to be done.
Mr Vijaya didn’t hesitate to help the two women with two young children, who said they had lost everything in a fire.
He let them stay in the brand-new house for free, but has come to regret his good deed.
“They took all my electronic things, TV, my Hi-Fi system, Xbox,” he said.
They even sprayed the contents of a fire extinguisher on the carpets, BBQ sauce on the walls and ceilings, and motor oil all over the laundry.
The women had been in the house for just two weeks before disappearing.
One woman had given her name as Ruby – a name which has now been passed on to police.
People have taken to Facebook to express their disgust while others have offered to help Mr Vijaya.
One claimed it was “disgraceful” while another said “what grubs to do this”.
“When you give some people something for nothing they don’t appreciate it, they care nothing for it,” one commented.
However many offers to help clean the property have restored faith in humanity.
“I’d be happy to come and clean out the air conditioner for free for you mate,” one commented.
Another also offered a lending hand.
“That poor man only doing it out of the kindness of his heart … who does this to someone. I hope he gets compensated for this. I’m also happy to help clean his home if he wants a lending hand that’s a lot to clean,” she said.
Anyone with information is encouraged to call Crime Stoppers on 1800 333 000 or use the Crime Stoppers online reporting page.