Do your nightly rates get cheaper the longer I stay?
Yes. The longer you stay, the lower your nightly rate.
Getting the house all ready for you is the same whether you're here for two nights or two weeks. That's already built in, so the price you see is the price you pay. Over a longer stay it spreads further, and your nightly rate comes down.
So settle in. This is a place that rewards slowing down, and a longer stay is costing you less per night.