Its very difficult, I find, to do this sort of thing ie pricing for an advert. So many variables.
for instance - minimum charge - mine is £48 for fairly local jobs.
also the more I do in one premises, the more efficient pricing.
ie I may start off at £2.50/m2 (subject to minimum), but by the time I get a bedroom it gets cheaper per m2. (on the basis they are generally cleaner, therefore quicker)
Hall/stairs/landing - you range from £18, £29, £42
HSL on its own and assuming its a smallish hall and smallish landing would be £40 (£48 with minimum charge).
but one house I do the landing is like something from Dallas - wraps all around the front of the house.
Not much help to your dilema I know - buts its the complexity of listing prices that keeps me from advertising them - but I see where you are coming from.