Calling all WiFi Experts: How can I get good wireless coverage in very big 2-story house?

The house is about 3,000 sq. ft. on two floors (there’s actually an apartment-attic and basement too but we don’t need coverage in those).

Will one high quality, centrally located router suffice or do I need a repeater somewhere else in the house? Or is there some other solution?

Thanks in advance for your wise counsel.