I visited Berlin last weekend with my friends. It was a fun, grey, cold and a busy weekend. In Berlin I loved the food, the amount of coffee houses, the breakfasts, the wallpaper at Café Fleury, the U-Bahnhof tiles, the laughing and the company. I would recommend:
Shopping - Muji, Alte Schönhauser Str., Neue Schönhauser Str., Mulackstr., Mariage Frères tea at Galeries Lafayette
Eating - Breakfast at Aunt Benny's, Petit Fleury Café, Monsieur Vuong
and wearing comfortable shoes.