Housekeeper Needed - Full-time / Part-time

The house is large (3, 900 sqft) but we don't use all the rooms all the time, so depending on the week, some rooms won't need cleaning. On the weeks that some rooms are not used, we would like to have the flexibility to ask the housekeeper to focus on other areas that might need a bit of extra attention. Our schedule is flexible. We do not currently have pets or children (under age 18) living at home.