My boyfriend and I stayed at Martin's place for three nights and enjoyed it a lot. It was very clean with nice comfy beds and everything you needed to cook some basic meals (except space, so don't expect to be able to cook a 3-course-menue, but for some spaghetti it will be just fine ;))
Martin always made sure we had everything we needed and was available in case of any issues all the time.
As the Westbahnhof is really close it was easy to get around but we even walked twice the 40minutes to the city centre.
We highly recommend staying at his place :)