CM from Germany seeks cheap housing starting at the end of August

I am a mechanical engineering student from Stuttgart/Germany and I will study one year at the GWU, so I am searching for cheap room in DC or Arlington.  Because of the weak exchange rate from Euro to $, I would like to find a room until 700 $ or less.

I am a 23 year old christian and in Germany I belong to the Evangelical Church of Württemberg.
So I would like to live together with other christians.

If you have a room available send me please a email to martinwerz[at]gmx[dot]de .

Thank you