My family have recently gotten a couple of 9 week old kittens (rag dolls). My partner and I disagree what is appropriate environmentally, and neither of us has had a cat before.
One of us seeks to limit the space they are in to a bathroom and passage for the foreseeable future, insists on fully cleaning every surface at least daily, and ensuring people wash their hands before touching the kittens.
The other thinks this is overkill. While it is agreed that the environment should be reasonably clean, their thinking is along the lines that an enviroment that is clean enough for people to live in (and reasonably clean in general) is adequate, and tends to the belief - extrapolated from belief about humans - that an environment which is too sterile may actually be bad for the kittens because it does not stimulate their immune systems.
It is likely that this disconnect will extend as the kittens are given more freedom within the house. A related question is to what level does the house need to be cat proofed (for the welfare of the cats, not the furniture) - eg is it necessary to remove indoor plants like bamboo, and ensure that fruit and vegetables are enclosed such that the cat can't get to them etc.
My question in summary - Other then cat specific needs like litterboxes, food, water, scratch-posts/cat trees, toys etc - What accommodations reasonably should be made for kittens/cats living in a typical house to ensure the environment is safe and appropriate.