Cooking, sleeping and such will no longer be judged as inappropriate when your Sim visits near relatives or good friends. Sims will also not find your Sim's behavior inappropriate when they first show their gratitude to the host (good manners trait), as long as the buffs are active. A toddler's behaviour will never been seen as inappropriate.
This is just a taller version of these base game doors. I needed them originally for a New Orleans style build because the original versions don't look right on the taller wall heights.