Need Flat for rent

I am Faisal from Bangladesh. I am a master degree student. I came to Germany few days ago. Since then i stayed in my language institute's hostel. But its very costly for me & some other Bangladeshi students. So we are looking for a well equipped flat at least for 6 months. We are here in Koblenz for our German language course. Which will last for 6 to 9 months. So, we need a flat (3/4 rooms) badly within December 15, 2013. We are able pay the rent comfortably if its around 500-700 euro per month in total.
Thank you.

Shaha Abdullah Faisal
----/-------