It's a mix of all genre (excl. Melodramma!!!, THANK THE AUTHORS FOR THAT).

Acting/Cast:
IU oh the goddess plays a phenomenal FL, portraying a badass women in power to a sensitive and vulnerable person wating for the right one. She plays as an amazing proprietor, bringing a mix of comic, tsundere and warm-quirky personality to the table. With her at the center the show was full of laughter.
In terms of the ML, however there isn't much to comment on and perhaps a slightly better plot for the role could have presented more to comment on. Overall the acting was good (as usual) and doesn't leave much to comment on.
Other recurring casts weren't also fine with my favorite being the receptionist (he was too cute). The cast was well matched with IU as hotel staff and had complete backstories. They portrayed their respective roles quite well and matched to the theme of the show perfectly.

Story:
If I have to compare the storyline it is similar to xxxHolic (Anime and Manga series from CLAMP). It had all the similar vibes with a guy being able to see the supernatural and getting help from a woman. I loved xxxHolic and loved this too, especially the cast for the FL lead (if they decide to make a live-action remake for xxxHolic, IU and Seo Yea Ji are the ones to go for).
The series had new plots however didn't feel much intuitive compared to other ghost stories. Still it managed to keep me at the edge of chair, waiting for what happens next, guessing what new trouble our dear ML lands himself in, or how the devilish beauty of a FL rescues him. (slight spoiler)

There isn't much of a rewatch value for this reason alone.

The story wrapped up on a good note, however, it felt too short and could have lasted for atleast 8-9 more episodes quite easily. I still await the second season starring (starring Kim Soo Hyun). But then I feel the same for most K-dramas,