This was an outstanding place to call home for the 4 days me and my partner were in Berlin. Martin got us settled in really well, and the place was immaculately tidy on arrival with all the small things considered to make us feel really at home.
Location-wise, it is also fantastic. It's about 5 mins walk from Jannowitzbrücke station that serves the S-Bahn line, which easily connects to Schönefeld Airport as well as lots of great tourist destinations.
We couldn't give Martin or his apartment any higher a recommendation. If you're in Berlin, you can't go wrong staying here.