Living in Cologne

So here is the situation: I am probably not going to have a dormitory room to live in.
It all dates back to March, before I departed for New York to attend model United Nations. My partner, Judy was really determined to finish all the application in March, she urged me to do so, too. However, I was really busy at that time so I decided that I will wait until I come back from New York. Judy went through the application process and successfully applied for the dormitory. By the time I finished the application in mid-April, there were no more vacancy.
My school, the Cologne Business School, is a small school with about 1000 students. Therefore, the dormitories for international students can only take 32 students. So by the time I applied, it was already too late. Now, I will look for flatshares, because I would like to have a kitchen to cook and also meet new friends and roommates from other countries. The price is ranged from 300 Euros to 500 Euros, I will choose the place with the rent under 400 Euros. I am seeking every possibility to search for a place to stay. There is a Facebook group for all the international students in Cologne Business School this year, and there have been updates on rental information. I hope I can find my ideal place to stay soon.