Planning a 4 month stay in Tübingen (From Mid-March to Mid-July)

I am Francisco Melendez a PhD student from the University of Malaga (Spain). Last month I agreed with the department of Computer Science of the University of Tübingen a stay as an invited researcher at Pr Kirsch research group. Here is the link to the group page:
http://www.uni-tuebingen.de/fakultaeten/mathematisch-naturwissenschaftliche-fakultaet/fachbereiche/informatik/lehrstuehle/human-computer-interaction/home.html

It would be very helpful your support to find accomodation for dates 13th of March to the end of June or mid July (I can be flexible on the check out date). I will travel with my partner, so the accomodation requested is for two people and our preference is to have a private furnished flat. We have no special willings in terms of rooms, additional services, etc. a private, comfortable, well-connected place and Wi-Fi connection will be enough for us.

Thanks in advance,

Best Regards,
Francisco