I'll say Humilau City! The music is nice and upbeat all year 'round, and the houses stand on platforms surrounded by the ocean. Not to mention those houses have the best interior design I've ever seen. Definitely somewhere I'd love to live. If I could live there, I would move straight away!
I also like Aspertia City. It has a great view from the lookout, and the music makes me feel so relaxed, like at home.