You are a tenant, your bathroom is damaged because there is no ventilation or a window or an inaccessible velux.
There is a simple way and a formidable efficiency: after the shower, put a fan on the step of the open door, the flow directed towards the bathroom. Open the windows of the adjoining room wide, and draw air if possible.
Run the fan for about 10 minutes while leaving the windows wide open.
The fan will push dry air, the humid air will come out above the fan, and will disperse and with the windows open and the airflow all will disappear, and your room will be healthy.
If you do not have time, at least do not close the door of the bathroom after use, because you confine the humidity and it is the ruin of the bathroom. leave the door ajar at least
It costs almost nothing, and it works very well.Suggest a tip for this theme