I know I'm a little late to the party! lol But I've always quoted on the job opposed to per hour. I also won't give a price without seeing the property anymore as been stung far too many times. Visit the property and quote accordingly. As someone else mentioned, fridge/freezers, appliances, oven clean etc how dirty is the property, touch the kitchen cupboards to see if they are layered in fat, have a look on top of kitchen cupboards etc