So many things I enjoyed so its hard to think of just one thing to be my favorite. But I'd have to say my favorite personal space right now if the Lockwood Prairie/Prairie Saloon Clubhouse. Because their so huge!! And I also really love the Veemee Hot Rod LMO's right now too. I was having so much fun with them that it actually delayed me from playing GTA V for my first time.
Furniture: perhaps the various guitars
Clothing: guitars or baseball outfits
Personal space: I don't know but I might choose Rapture because it's fun and if I remember right it was the first one to have old music. (I never played Bioshock.)