Noun, Na-adjective (keiyodoshi), Noun which may take the genitive case particle 'no'
love of cleanliness; liking to keep things clean; tidiness (of people); neatness
みつなは綺麗好きだから、よく自ら進んで掃除をしています。Mitsuna is very tidy so she often cleans up without being asked.
Also written 綺麗好き【きれいずき】、キレイ好き【きれいずき】