The apartment is spacious, light and well appointed. It is close to a U-Bahn stop and not far from an S-Bahn stop. I didn't try the buses and trams but they were nearby. It is also very energy efficient. I didn't use the heating even though I was there on a day when the maximum was 1. They also encourage recycling which is great.
There is a supermarket and 2 organic food shops very close by open long hours, except maybe Sunday - can't remember - but many stores are closed on Sundays. Didn't affect me as I was not in Berlin on the Sunday I was there. These shops have everything you need to self cater.
I did lots of walking and there is so much to see and do within a 40 minute walk.
Sven was very responsive right from the initial enquiry. He arranged for someone to meet me at the apartment and show me around. This was greatly appreciated as I had a 28 hour journey.
Would definitely recommend staying there - it will comfortably hold up to 6 people although I was by myself.