I can totally understand that some guests prefer minimalist "less is more" surroundings and others enjoy the art work more. I try to accomodate a wide range of guest preferences.
The portable A/C not being shown in the photos is a good notice. The photos were taking during winter months when the A/C is not put in the room, for obvious reasons, it's not needed during that time. However, I think it's a fair criticism to show the A/C unit in the photos as well. We've had unusually warm weather this past weekend during your stay, usually just opening the sliding glass door to the balcony at night is often more than enough to cool the room during the summer.
I am sorry that despite the fact that te photos clearly show what the room is like, you felt the room was overwhelming. Thank you for your feedback; I will add some photos showing the A/C unit per your suggestion. Thanks for the feedback, I always strive to improve both room and listing.