Book A Local, some highlights from a guided tour in Berlin

I have so many great pictures and places from my Berlin trip that I want to share with you, but let's start with my first day there. I booked a guide to take me around the city, through a site called Plus One Berlin. The concept is this: You tell them about your interests and how much time you have, and you get to pick your guide from their list of "locals" ( = Berlin inhabitants who are all dying to show you the best spots around the city) to take you around for a day.