That is a good idea. I had tried that in one of my games, putting a bed and bathroom in. Funny thing though, when I would take my sim to the park, which is where I made a special room, there would be like 6 or 7 sims in the room, just hanging out. I put a stereo and tv in there and people were lying on the bed, some were dancing to the stereo. Looked really strange, lol. Small room for so many people.
I have seen the toilets and sinks break at the park, but the next day, they were ok, like imaGleek said.