There are no characters, so this is 100% environment description to create mood.
And it's creepy!
This snippet is a relentless stack of details about darkness, decay, and abandonment, plus some grotesque size details thrown in for good measure (a hundred tiny rooms, but one contains a squat, giant furnace?).
How do you respond to this mood?
In particular, what kinds of things do you imagine will happen here? 😬