I loved Pastoria, Hearthome, and Snowpoint. :D I'm not entirely sure why I liked Pastoria so much (maybe it was because it was near a rainy route...?) but Hearthome was because of the poffin making and Amity Square. I used to be addicted to growing berries, so I had a lot to use when making poffins~ And walking around with some of your Pokemon before HG/SS was an amazing experience. It sucked that it could only be "cute" Pokemon at first, though...
Snowpoint was snowy and had the most relaxing music ever. And I liked going into Candice's gym and playing around with the ice and snowballs. :3 I also enjoyed the villa a ton, too. It was so...fancyish. XD It was a good place to relax in.