Maid service expectations of a client are some of the lowest in all of the service businesses. You don't have to drive anywhere, you don't have to walk any where, you don't have to stand in line, or wait to be seated.
The housekeeping client, on the other hand, has some of the highest and most subjective expectations ever imposed upon a service business. These high, subjective expectations also vary from client to client.
The other thing that varies from client to client is the layout, condition, and job specifications at the service location.