If you are searching for an unfurnished apartment, this is the most popular site in Germany:

http://www.immobilienscout24.de

Otherwise, you can check Craigslist Munich for apartment listings, almost all of which are furnished. Alternately run a simple search on Google for "Furnished apartments Munich" and you will see lots of different companies providing basically the same service.

Edit: I misread the original question, the OP is only staying for a very short amount of time.  My advice is best suited for people staying over a year.

Apartment in Munich
This may be a stupid question, so feel free to shoot it down.

Assuming all atoms have a magnetic moment, I would assume the water molecule too would have a resultant magnetic moment; ergo, it may be possible to magnetize a body of water. 

Can water be magnetized? 
