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He had to live off just his clothes and a sword for most of his memorable life, so the second he gets a permanent place to live and a stable environment, he goes out of his way to fill his space with cool things that make him happy since he now is able to have things with no function or use other than just being cool and fun. Nico Di Angelo would totally be a maximalist, and he takes regular trips to the city with Will just to visit a bunch of thrift stores and antique shops. There is no shelf or table in the Hades cabin that does not have some sort of statue, picture, bone, or book on it.
headcanon that nico di angelo is actually very maximalist, and the hades cabin soon looks like an old antique store