Our room had black mold and limescale in the shower, the drain also didn't work correctly. Their excuse for not cleaning: the showers will be renovated in a few months. Next to this the heater barely worked and the internet was slow and dropped multiple times during use.
They offered us a different room, but not one with a renovated shower because then we would have to pay extra even though it was late at night and the room was available anyway. We got offered a similar room, we had to check it out ourselves to see if it was clean. Of course, it was not.
There was a spa included. They later shared the spa was closed due to covid. There was not even a spa to be found on the third floor, not even to be seen on the emergency exit maps.
If by Art Hotel you mean a few images of chickens, then yes there are chickens, but it had no charm.
As we couldn't find a solution we decided not to make too much of a fuss about it (who wants to stress out during their long-awaited holiday) but we are unable to share a positive review.