Dan's stylish apartment was very clean and the location was very close to the S-Bahn (train), underground and bus stop and is located very central in Berlin. There are some grocery stores close to the flat. After a 10min walk you reach the department store ALEXA at Alexanderplatz, that offers a huge choice of shops for clothes, beauty, food, electronics, etc.
But the best part was Dan himself! He was considerate, flexible, generous and quick to respond to my emails.
Additionally Dan gave me some travel tips for the weekend. Thanks Dan!