NOT A 4-STAR HOTEL!
The room that I stayed gave me a horrible headache! At nigh, an extremely bad odor was suffocating me. I got up several times during the night to investigate and it turned out it was coming from the bathroom shower drain. Because I was so tired I did not call room service until morning. I was trying to correct the problem myself by opening the bedroom door, closing the bathroom door, placing a wet towel over the shower drain, opening all curtains and windows. By morning, the smell was gone. As a professional builder, I believe that this building does not have proper plumbing ventilation. It seemed odd that a plastic cover was over the shower drain. My guess is that at night the city sewer system stops moving the waste because of lack of water running and thus the feces stagnates and thus the odor escapes by any means. I have to admit that after I told them about it they were willing transfer me to another room. By now, I was done with this hotel. I hope they fix this problem because this is not sanitary and thus not a 4 star hotel.