Pocket Village - www.pocketvillage.com

I found out about the site when i searched for tours in Berlin on my phone. There are not many tours yet but they have the best deals for what they have. It`s last minute so same day tours usually, it`s a must if you don`t have a certain plan for the day, just go on the site in the morning and book! I did the Potsdam bike tour btw, a bit away from the city center but a nice alternative to classic tourist to-dos and it totally worth it!