The kitchen part, above the character, is unstable at best. Try to use it and it will fall onto the ground the moment you push your hand on it. I won't comment on the lack of a water source (no faucet, either it's missing or they use buckets of water).
I wouldn't put a sink in there at all. It has a plug hole, but it's sitting on solid rock, so where does the water go?
I think you also need to edit your rocks a bit more. They are much lighter and brighter than the rock which makes up the wall, so that they do not look like they come from the same general location. Why import rocks from somewhere else when there is plenty locally? They need to be much nearer the color of the walls.
Beds on rock piles? If the people there are able to cut rock (since they did so for the bookcase and such) why would they sleep on round rocks?
How did they manage to get a rug *under* the rock piles?
I'd get rid of the hole, but then there'd be nowhere for the water to drain!