One of the things that I love about Seoul is the flexible zoning in residential areas that allows folks to use their space as a commercial entity. While having a coffee or barber shop next to a row of homes may seem weird for many folks in the US, I find that it adds a great deal of charm, diversity, and convenience to areas.

That said, one of the biggest criticisms of this approach to zoning in the city is that it leads to a faster pace of gentrification which can price people out of the areas, so it's not all peaches.