The flat is comfortable and has everything as described, it is located in a rather iconic building and there is a great view over Berlin from the balcony and window. The public transport to the city is very good, it only takes a short ride on the S Bahn from the station around the corner to the centre of Berlin.
While there are not many shopping opportunities in walking distance (though a couple of stops away), the green surroundings make up for that. I had no complaints.