22 year old student looking for accommodation in Warsaw

Hello Erasmus members!

I am a 22-year old student from Greece and will be in Warsaw for 4 months, from February 2014 to June 2014. I study Law and will be joining the Euroregional University of Jozefow and couldn't be more excited visiting one of the most historically interesting countries in eastern Europe! 

I am looking for a small and cheap, but functional apartment in a good state, mainly in central Warsaw. Suburbs are ok too, as long as it is not too isolated. I want the apartment to be furnished, preferably have a double bed. Plus, I'd like it to be on the 2nd floor and above (not on the ground floor or 1st floor). Internet access necessary!

My budget is limited, I can afford an apartment up to 450 euros (maximum) per month (which will include all utilities/bills). 

Cheers!