This is the second time we've stayed in Andrea's flat - it was so good we had to come back! The flat is superb - large, airy, well-equiped (Andrea has a great selection of books, if you have the time for reading...). In addition, the flat is fantastically located - just 5 minutes from the U-Bahn/S-Bahn, and Prenzlauer Berg is a great neighbourhood - lively in the evening, but plenty of really good cafes for relaxing with friends in the day. I have to say, it would be difficult to find a better combination of great accommodation and fantastic location.
Andrea is easy to communicate with, and his cleaning lady is wonderful!