On my first trip to Berlin in 2004, I went for just a weekend but ended up staying for a month. The city sucks you in that way and I swear it has something to with the incredible smell of their bread that permeates the city - it does something crazy to your mind! It's intoxicating as whole: both its history and contemporary incarnation, the incredible clubs and beautiful outdoor spaces, amazing bicycles, veggie food, and coffee. It is more than a weekend city, so don't even think about trying to see it all in 2 days. From Neukölln to Prenzlauer Berg and Friedrichshain, Mitte to Kreuzberg and Schöneberg: you can easily spend a week discovering this incredible city!