I had two in a one bedroom apartment, and they were just fine. I'd definitely keep two kittens, because one will drive you batty. There's no way for a human to play as long and hard as a kitten wants. I definitely had room for another cat or two, but I'm glad I stuck with just the two. I can't imagine trying to move more than two, or vet bills. If you do all the immunizations, it's a lot of money to raise kittens.