The apartment was very clean, water pressure was great, location was safe and central to Berlin. We were able to walk to all the attractions. The apartment was easily accessible by train. WiFi worked well during our stay.
I would highly recommend Martin's place for a stay in Berlin.

Martin made check in and check out very easy. He greeted us at the apartment and was very helpful as this was our first time in Berlin. He left us some drinks which was nice.