We took two rooms at the Masada Guest house, although four people can fit if one is willing to take a top bunk. They are designed to accommodate groups, with the bathroom arranged so that the shower, toilet, and sinks are separate from one another. Towels were provided, as well as plastic packets of shampoo, but this was the one place we stayed where I was very glad to have packed my own towel and toiletries.
We had dinner in the dining hall (about $12 pp), which was a buffet reminiscent of a college cafeteria. Not bad. (It was winter and dark very early, so we didn't feel like looking elsewhere, and this was a nice option to have.) The breakfast was also a fairly nice spread, included in the room rate ($105/night/room).
We were able to store our luggage in the office while touring Masada. This isn't necessary for those who get up early to climb before dawn and come back down before check-in time, but it was nice to have that option.
One unfortunate issue was that the elevator was out of order when we visited. This probably wouldn't be an issue for backpackers, but it was quite a schlep for a family of rour touring the country for two weeks with luggage we didn't want to leave in the car.
This review is the subjective opinion of a TripAdvisor member and not of TripAdvisor LLC