The apartment although not in central Berlin, was very close to Sudkreuz station which made it very easy to get into central Berlin. The trains are very simple and efficient so the location was never a problem!
The apartment itself was warm, inviting and had everything you could possibly need. Would not be able to fault it for cleanliness in the slightest.
Gerhard was an excellent host - giving immediate help and advice whenever it was needed - including giving local recommendations and instructions for how to get around the city. Overall our stay and experience was great!