why do u only charge $300? i have no idea where Yamanto is, but  a rent of $100/wk/room in my opinion should be the least you should charge. have u asked around about the market price for rents in Yamanto?

if u can sell for $350000, i suggest u sell it and buy 3 properties costing $100K each that are positively geared. negative gearing is not a wise investment if you do the maths. if u think otherwise i can do a quick math for u to shed some light on why positive gearing is the way to invest correctly and be more wealthy.