High-end flat in a great location off leipziger strasse. Stefan and his assistant were kind enough to meet us at his place of business and drive us to the flat giving us suggestions of what to see and do. We had a great time in Berlin as it is a beautiful city with an amazing history while being safe and accessible using public transport. The only real issue we had was with the internet as it cut out intermittently, but as this was a minor issue, we thoroughly enjoyed our stay.
Would definitely recommend Stefan's place and would stay there again.
Thanks.