Accommodations on Kilimanjaro vary depending on which route and company you choose. On the Marangu Route (often called the "Coca Cola Route" because of its touristy nature and the availability of soda and beer along the way), you stay in huts along the way to the top. We took the Marangu route down and saw the luxurious accommodations and bathroom facilities that were available.
On our Rongai route, we tent camped the whole way. Even while hiking down the Marangu route, we still had our tents pitched right next to the huts.
Can't complain though - check out our extraordinary view over a sea of clouds. Also, it's not like we pitched the tents ourselves.
Each day, when we got into camp, we had porters grabbing our daypacks and showing us to our already set up tents, complete with luggage and bed rolls. The next morning, while we were having breakfast, the porters were working to get our camp all packed up and moving towards the next spot.
Yup - camping on Kili was a pretty sweet experience. It was quite luxurious seeing as our only jobs were to hike, eat, sleep, and enjoy ourselves and the beautiful scenery around us. We may not have had huts and showers, but it was probably the best service I've ever gotten on any vacation.