We're Xers and bought a 450 square foot condo last year for about 300k in downtown Seattle. We have the same murphy bed shown in that video! It makes our studio work like a one bedroom.
Our decision was mostly financial, but the non-financial perks have been great too. We're in an amenity-rich building, we can walk everywhere, and our housing costs are super-low. (HOA plus property taxes) It feels nice to have less stuff to deal with. Lower costs + a cheaper house sped up our time to FI by about 5 years.
When we had a regular house we spent our weekends mowing lawns, cleaning, running to Home Depot, or doing Costco runs. These days we make coffee, walk or bus to a nearby park or festival, or hang out. We didn't really use our old dining room so we put in a "library" with a huge bookshelf and a comfy chair instead of a dining space. Our coffee table lifts and expands to accommodate meals with friends. Life feels so much easier these days. We recently took the plunge and got rid of our car - we didn't need it any longer.
Probably the biggest mental shift was how we see "our home" as being our neighborhood, not just our little condo. Our gym, the library, coffee shops, parks... they all become part of where you live.
I don't think this situation would suit most people. But for a childfree couple it's been a really nice setup. If you lean towards minimalism and city life it's a great fit.
SIS