MK: Showering is very difficult in space. First of all, you don't have a lot of water in the first place, so you need to conserve it. So what you do is basically take a sponge bath, but with a towel. You spray water into a wash cloth with some soap, and wipe yourself down. As far as shampoo goes, it's no issue to me [Here's a pic of Kelly]. But we have shampoo that doesn't use any water. It's just some chemical compound that you use, then just wipe off. It seems kind of nasty, actually.
On having your own space
MK: Well, the ISS is about 5,000 square feet, in internal volume. There are a lot of different modules (like rooms). We have what you would consider to be a "normal bathroom," but you generally just use that for going to the bathroom. Generally, you'd get ready and everything in your sleep station, which is kind of like a phone booth. Sometimes we'll set up part of the shuttle and turn it into a hygiene station, as we call it, where all your toiletries are Velcro-ed to the wall.