we have three girls (ages 12, 5, and 4) and one five-month-old kitten in a 1625 sq foot house. for the most part they are low-key in the house, but one of the two younger greys does have her moments every day when she feels the need to run around the house ("zoomies", they're called). they've been cat-tested by the adoption group we deal with, and were considered cat-safe, but we keep a close eye on them since we've taken in the kitten. nikki and katie don't pay too much attention to him, but sadie has chased him around and play-bowed to him because she wanted to play, but the kitten doesn't understand that.
we walk them twice a day (15-20 minutes), and at lunchtime if i have time to spare since i work at home.
the books referred to are good sources of information. be sure to give the adoption group you deal with all the information you can about your wants, needs, or limitations. that'll help them to find the best match possible for you. go out to some meet-and-greets that adoption groups do if you haven't already.
good luck!