The House: Kaika no Ouji-sama

Akari Honda, 26, works for a web production company and writes on the side, enjoying a remote life in a house full of her favorite things. Then, a "prince" suddenly appears. He lives in the room below and complains about noise and strange smells! But then he makes Akari's life at home sparkle with happiness, even though she's supposedly a nuisance to him...!

(Source: Shogakukan, translated)