27-year-old visiting researcher at uni-bonn looking for one room

I am now a PhD candidate of Electronic Engineering, Tsinghua University, China, and going to be a visiting researcher at University Bonn for 6 months.

I am searching for a room near Institue of Computer Science II, Uni-Bnn, whose postcode is 53113.
Locations within 20 minitues walk or 15 minitues bus are prefered.

My wife will live with me for the first 5 weeks until Mar 6, so I need a double bed, or at least a bigger bed. In this period, we will go on a two-week tour around Europe, so we will live together in the room for only 3 weeks.

The visiting is supported by my university and I can provide the certification.
Whole term is prefered, however the house which is at least available from Feb 1 to Mar 6 is also accepted.

I am still in China now and will be in Bonn at Jan 27. So please contact me via email if you would like to give some help to a foreigner and know some Chinese culture. :)