What is your favorite kind of apartment?

In sims 2 you could build whatever you wanted as an apartment building as long as you used the apartment entrance doors. So we basically built the entire lot the way we want it, not just one apartment but also the entrance. I had row houses/terraced houses and even a castle with different houses which functioned as apartments. It was a very good tool have multiple families live on the same lot but only control one of them.