What expenses are allowed on investment property?

As a new landlord, I keep my own accounts with regard to expenses etc on the investment, I use the Dept. of Finance leaflet as a guide.
I want to know if travel to and from the property is an allowable expense for my accounts on this property. The property is 50 km from my home residence so a round trip is 100km. I have estimated that last year I made 10-12 trips to property (showing tenants, grass cutting etc). If travel is an allowable expense, how much can I offset per km travelled

Any guidance very welcome
J