Phisherman wrote:

It is bad to vent moisture to the attic space...

No problem, with a bathroom fan, if the attic itself is well-vented.

...Your landlord is wrong about closing the window.

Maybe not, if it's humid outdoors.

Keep the fan running for at least 30 minutes.

Or use Herbach and Rademan's (800) 848-8001 http://www.herbach.com
nice $4.95 Navy surplus humidistat, their item number TM89HVC5203,
with a 20-80% range, a 3-6% differential, and a 7.5A 125V switch
that can be wired to open or close on humidity rise.

Water vapor constantly seeks lower temperature areas and moves away
from higher temperature areas.

Do you live on a planet with sentient water vapor? Should we put wet
clothes in a freezer instead of a dryer so the vapor can seek its
way out faster? :-)

Nick