Believe it or not when I was working full time I employed my Mum as a cleaner as she doesn't work and was looking for a bit of something to do. I used to pay her �7 an hour, I know I was probably being generous because it was my Mum, but if I was employing anybody to do my cleaning I wouldn't pay any less than �6.00 per hour for about three hours per week although I suppose it depends on what part of the country you live in. With regards to the etiquette, as I see it the cleaner is there to clean not to tidy away all your rubbish, for example, I wouldn't expect them to pick dirty clothes off the floor so that they could hoover it. I would draw a little informal (seeing as its your friend) list up to say what you expect them to clean and to what standard and you should provide the cleaning materials too. Hope this helps, as its your friend though it could cause trouble if you are not happy with their work.