I really liked Ava's (very neat with a cute kitchen theme), Lionel's (very regal and refined), Jacques (cool dj theme), Kitt's (classy), Cranston (I love his stork/baby theme. :3), and Tiffany's (like a city nightclub) the best.
i really don't like him but frobert's house is adorable. just because i really enjoy the polka dot series, and i'm not sure that any other villagers have that much of it in their house? (correct me if i'm wrong)
i also love claudia and zell's. so basically if they have a piece of furniture from gracie, the cityscape wallpaper, and plants, i love their house.
and frita? not that great, but i love food court/restaurant themed rooms so she's up there. i loved gayle's house too because dang thats pink. but by the time she left my town literally all she had was a locker and some fish. idk what she was thinking.
i'm not a fan of rolf's house though, the tent look isn't that great. especially the wall :/
I had cherry once in my town and her house is freaking awesome (from inside and out)! she has the sleek set and it really suits her personality and her emo style and her exterior has her colors!