I've got 3!! A Brahma bantam hen I've had several months in one cage, and two bantam cochin pullets I just bought (as least I HOPE they are both pullets) in another. I live in town, in a townhouse, and I'm very much into 'urban farming.' I grow veggies and herbs in my tiny patch of back yard and on the deck. I also raise rabbits - French Angoras for spinning fiber, since I'm a handspinner - and they are in the house too. My spare bedroom has been turned into the 'barn.'
I had two large rabbit cages left empty......so why not chickens!? When I got my first hen at a poultry show, I stopped at a feed store on the way home, and when I asked for 5 pounds of layer mash and grit. The lady at the counter looked at me with a straight face and asked if it was going to be a house chicken!
I took the wire floor out of the rabbit cages, and let them scratch in what was the dropping pan. Add feed and water containers - again, rabbit bowls that screw onto the side of the cage, up out of the pine shavings on the floor - and add a 1-inch dowel for a perch, and there you go! My girls love attention, the new babies, especially. If I sit on the floor and put my elbows out like wings, they will run under my arms for a snuggle, like they did with their mom. They each have their own personalities. The hen has learned to 'step up' like a parrot, and rides my arm from place to place in the house. She loves to perch by the glass deck doors and watch the world go by. I'm making a covered 'chicken tractor' so they can get out for fresh air, and to dig in the grass for bugs.
