We have a large brooder in the spare bedroom where we have been keeping our 2-5 week old chickens (8 of them!). There's plenty of room for them and it's covered, but I did find I had to put an air purifier in there to keep the dust under control (worked magic--seriously!). It has been so dang cold and snowy here that I just haven't felt right about putting them out in the coop yet. The boys and I keep that room immaculate, more because I am a nurse and don't want to be breeding nasty germs in their brooder and making the chickens and everyone else sick than anything else (though I'm not keen on messiness, either). About once every other day, I cut the Roomba loose to make sure the floor stays tidy, and the chickens seem to be completely unfazed by the noise the Roomba makes. It is really quite nice to pop in to visit the chickens and hand feed them treats--the Andalusians, in particular, are enormously friendly and jump right up on our shoulders (rather a problem when I'm in my work clothes!). One of them flew up to the ceiling fan (which is not kept on, of course) and got herself a nice, squawking merry-go-round ride for her efforts.
I can't really see the prob with keeping chickens in the house--though I wouldn't keep more than a couple in myself, once they are old enough to cope with the weather outside. As someone else pointed out, I'd rather deal with chicken poo than cat poo--my cats don't even get the priviledge of a catbox at my house--they must go outside to do their business. Assuming the birds are well-cared for, they are, in point of fact, no different than any other pet and certainly don't take up as much room or require as much care as some of the massive dogs I've seen people keep. I think the prob comes in on how folks view chickens--they are barnyard critters, right? There is a certain amount of "not clean" thinking that goes with that.
I don't personally want my chickens wandering the house, but that is more a matter of having four cats who would love to dine on them (and darn if I'm cleaning up the feathers afterwards! Enough with the sparrow hunting, already!!) and three young boys who would likely find it hilarious if the chicken pooped on my kitchen counter while I wasn't looking (what IS it with boys??). That, and I pretty much require anything that poops in my house to use the appropriate area and I doubt I have the time or patience to housebreak a chicken. Nonetheless, confined in my spare bedroom with a huge picture window for light, a UV bulb in one of the ceiling fan sockets, plenty of food, water, warmth, and companionship, the chickens seem pretty dang happy and they aren't troubling me in the least.
And, of course, I'd far rather have a chicken in the house than the snake my eldest son wants... To each their own, so long as all are well-cared for.