27 visiting researcher looking for one room(scholarship support)

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 will arrive in Bonn at Jan 27. The rent can begin immediately or on Feb 1. Please contact me via email or phone call if you would like to give some help to a foreigner and know some Chinese culture. :)