Martin was a wonderful host. His place was very conveniently located to not only the sights but also transit options in any direction you need, and also very quiet. Perfect after long days adventuring around the city and ready to rest. The studio itself was perfect - everything was very functional and well-equipped.
He gave us several insights into places to go and things to do - popular as well as where to go when you tire of the tourist crowds. Very accommodating - he even arranged a taxi for us on our way out of town. I would stay again and recommend his place to anyone coming to Berlin.