After checking in, I left my smartphone on the sheets next to my pillow then took a shower, and when I went to sleep and lay down on the bed, I picked up my smartphone to set an alarm and was shocked to see a lot of fine white dandruff-like things on the screen and back. I jumped up in a panic and wiped the surface of the sheets with a towel, but I didn't feel like sleep in bed, so I had a physically and mentally tough night. I'm sure that it was my first night, so clean bed sheets should be provided. I will never use this facility again.