I know that‘s not really the point of your study log, but just to let you know:
As long as you’re talking Berlin, you will be perfectly fine with English. By now Berlin has a very high population of foreigners who don’t speak German (especially IT folks). So everybody is used to people who can’t speak German. (For the rest of the country, this isn’t as extreme but you should still be able to get along with English most of the time.)
Anyways, if you need help or have questions, feel free to give me a shout (either here or via email, see my forum header).