All climbers sleep in tents (tents are included) and meals are served in a dinner tent or on a blanket outside.
It is done over 6 days, so acclimatization is easier, and the success rate is fairly high. It is for physically fit people with some hiking experience. Descent is down the Mweka trail staying at the Mweka or Millennium camp the final night on the mountain. See more: http://tanzaniajoytours.com/6-days-machame-route-c limbing/