Most old caves do not have anything built onto the front of them, i.e. they consist only of cave rooms set into the ground. The main, and important, advantage of this type of layout is that the rooms maintain a more consistent temperature summer and winter. This is because the external walls at the front of the cave are usually massively thick, sometimes two metres or more only penetrated by a door and a couple of small windows. The thermal insulation properties of these cave walls are extraordinarily high.
The principal disadvantage of this cave house design is that with the limited number of deeply set windows the rooms will appear quite dark (especially compared to modern conventional housing). While we all love the constant temperature we also like the light offered by thinner walls and bigger windows and so almost all cave renovations now include the addition of one or more rooms at the front of the cave, thus forming a cave house. These additional rooms almost always include a kitchen and bathroom.
A peculiarity often found in old cave houses is the layout of the bedrooms. Because of the way the caves have been excavated you can often find that one bedroom leads into another and yet one other, so you may have to walk through two bedrooms to get to the third one at the back. In most cases the individual bedrooms were separated only by thick curtains. This layout simply does not fit with modern norms of privacy. With a bit of thought it is often possible to get around this disadvantage by constructing corridors or alternative entrances to the bedrooms, but in other cases there is no practical way around the situation.