I could not sleep and eventually got a cold head and a cold after the first night. I thought it was a draft from the window, which was not open. Only on my third night I realised that it was the VENT next to the window and right above my head that kept blowing cold cold air right down to my head! I managed to shut it then it was ok. Why would a VENT be right above the head of the bed, rather than the foot of the bed?
I had a very bad headache for two days and it affected my work :(
Otherwise the 24-hour non-stop extraction fan from the bathroom was a good idea.