In main towns and cities in Tibet accommodation is of a good standard - clean, comfortable twin share rooms, clean shared/private facilities and hot showers.

Outside of the main towns (Lhasa, Tsedang, Shigatse, Naqu and Gyantse), be prepared to sleep in very simple guesthouses which are highly variable and often unclean. All hotel guest rooms are provided with a thermos flask of hot water for tea as well as comfortable beds with lots of warm blankets. While all the hotels are wired for electricity, power in some of the hotels/guest houses are limited to a few evening hours. Taking a flashlight along is a must.

Generally speaking, outside these main towns, accommodation is fairly basic in Tibet. Plumbing, hot water and electricity are erratic, there will be many days without showers, although a basin and hot water is available for basic essential washing.

So you'd better take sleeping bags for accommodation in simple guesthouses. Or you can also set up a camp if you will. Camping is often much preferable. For accommodations in those simple guesthouses in small places, bring your own disinfectant and toilet paper.