A friend's friend has a few rental properties in Bris and want someone to looking after them because he is inter-state. My responsibility involves open home, inspection, regular inspection, repair arrangement, emergency, etc. I don't handle any financial matters.
I have no idea how much rate shall I charge. Should it be by case or by hour rate? The distance from my place to these properties usually takes 40 min drive one way.
So you're basically acting like a Real Estate Agent without worrying about the rent collection??
A RE would charge a letting fee for finding tenants and a % of the weekly rent.
Ask yourself, is it really worth your hassle? Remember your friend can claim letting expenses and RE fees etc. on tax.
If you were to go the hourly rate, you would start the clock from when you leave home to when you get back. What about dealing with phone calls? Have a minimum rate for 'calls' not requiring attendance and 'call-outs'which do.
Personally, I'd leave it to a Real Estate Agent to worry about.