Conversation so far:
What is the chamber at the top of a lighthouse called
The lantern room is that portion of the top of a lighthouse tower
What are the remaining parts of the lighthouse called
The lighthouse is comprised of three parts: The lower service room, the optic section, and the dome.
Can someone live in any of the three parts of the lighthouse
Yes, someone can live in the lighthouse by either buying one, renting one, or becoming a volunteer or paid lighthouse keeper.

Question: What are the disadvantages to living in the structure
Self-contained rewrite: What are the disadvantages to living in the structure of the lighthouse