I'd probably live on the edge of Celadon City in Kanto -- it's large and central, yet close enough to the forest and the seaside. In Johto, I'd be in Ecruteak City ... or MooMoo Farm. Hoenn is Fortree City, no contest, because the idea of a city of trees I find immensly appealing. Sootopolis would be amazing to live in, too, because I love fire in general and would be able to walk over to the springs. Mmmm.
I agree that Snowpoint would be a neat area to live in. And Unova? I kind of like Nacrene City, a quiet town on the edge of the train tracks. It's near Pinwheel Forest, which is great (by now you've probably noticed that I need to live by trees), and I'd have a cozy little warehouse loft. Lacunosa and Icirrus are also definite contenders.
The more I consider this question, the more fun it is to think about. Each and every town has its own unique atmosphere, making it fascinating to imagine.