The place is converted from a garage. There wasn't any window in the bedroom or bathroom(i.e,. no ventilation, but there was an air pathway near the ceiling.), but the bathroom had a fan. The kitchen had a window. If the window is opened, I am sure fresh air from the kitchen can be circulated to the bedroom. I was sneezing a lot, but when I opened the window or turned on the heater(I think it can be converted to air conditioner and has an air filter. The winter season when I was there), I wasn't sneezing.