The hotel advertises air conditioning, but in winter there was no cooling available. The system only produced warm air. The room felt very humid and stuffy, and there was no proper air circulation.
Reception acknowledged the issues and suggested to keep the balcony door open, and a fan was also offered. However, keeping the door open made the room noisy, and I had to use earplugs to sleep. My refund request was ultimately declined, although they first suggested that refund would be accepted.
Overall, the sleeping conditions were not comfortable. If you are sensitive to air quality or prefer a cool room for sleeping, this may not meet expectations.