This is coming straight from what I said on /vp/ on 4chan. Yes, I go on 4chan
I'd love to live in Goldenrod city, it's a great big city rivalling Castelia and Nimbasa in population with loads of stuff to do. It's got a gym to challenge, the Pokéathlon to compete in, an arcade, the Bug Catching Contest, it's got the works. It's also in Johto, my favourite region.
My second choice would be Nimbasa, because it's got a freaking theme park in it and is within about half an hour tops of Castelia. Plus almost every reason I listed for Goldenrod.
On a side note, I'd love to holiday in Hoenn. Slateport to be precise. :3