From a more objective perspective, the manga is certainly decent. The story is not all that deep; it's sort of what you'd expect from a ~20 chapter manga about a cute tsundere succubus visiting an innocent, kind hearted salary man. It's definitely a work of wish fulfillment, for sure. That said, the characters are still pretty likeable, even if a bit cliche, and Gentsuki's artwork is excellent. The artwork, alone, is enough to give it a read.

From a more subjective perspective, I absolutely loved it and it's one of my favorite manga. Even though I recognize that, objectively, it wasn't anything groundbreaking, it still was exactly the kind of slice-of-life rom-com with monster/demon girls that I enjoy and it scratched that itch for me. I just wish there had been more.