For still existing planets, I think Naboo would be wonderful to live on. The climate is favorable, the scenery is beautiful, and the people are nice. You can have the city life in Thebes if desired, or you can have a lake house out in the country with nobody for miles. From what we saw in the movies, they tend to have benevolent leaders and tend to stay away from galactic intrigue and politics for the most part. It would be a great place to escape from the galactic hustle and bustle.
I also think Alderaan would have been wonderful, for the same reasons.