Falling Water is a perfect example of a modernist building that works because of a spectacular natural setting and the absence of any neighbors. It is a beautiful building. That said, I'd fire any architect who insisted on building in most of the furniture. I want to shove the La-Z-Boy recliner where I want it, not where the architect thinks I should sit to best imbibe his vision.
I don’t think it’s just the property. You could transport that design to many settings. I like Arts and Crafts design so the furniture thing doesn’t bother me.