Just returned from a six day trip to Berlin with my daughter and had a fabulous time. Although I was previously in Berlin in August of 2006, the city was just as vibrant, edgy and wonderful this time as it was the first time. Our first full day we took an eight-hour Brewer's Best of Berlin Walking Tour, and it was the most comprehensive, entertaining, educational tour I have ever taken in any city. Our tour guide, Robin, was amazing and made the day totally memorable and the high point of our visit. I highly recommend this tour to anyone visiting Berlin.
We visited all of the traditional tourist sites and my daughter was awed by all of the history she was able to re-live during our visit. It was very cold while we were there...it felt much colder than the temperature indicated...so if you're planning on visiting during the winter months I strongly suggest you wear lots of layers and bundle up.
I absolutely love Berlin...it's such a vibrant city with so much history. It was especially beautiful the week before Christmas, and we'll definitely be visiting it again.