Katchya is 100% correct concerning her views on the Marzahn/Lichtenberg area. I will detail my experience here. I am an African-American female studying German here for a year while completing my Master's degree in the states. My fiance is German/Russian with his mother residing in the
Marzahn area. Due to cheaper apartments, we moved to Friedrichsfelde Ost in the
Lichtenberg District. In simplest terms, the racism here is unequivocably massive for this to be 21st century Europe. I was always told that there was a greater tolerance in Germany ( because of past atrocities) than in the USA. That idea must of excluded East Berlin.
Although I have not been physically attacked, like I've read about some African individuals, the racism here was a shock to my system. In the beginning I shed tears and I had to put myself in the mood to step outside the front door. Many stare like they have never seen a black person before. If you stare back at them, some turn around. Others continue to gaze at me without blinking. Sometimes, my fiance steps inbetween me and the person who is staring when they will not avert their gaze. Other times, they glare at me like I am the scum of the earth. Clerks at some stores in this area have been hateful, but my fiance says it is not about my race, but general rudeness when it comes to customer service. The jury is still out on that one. When I speak English, it tends to be a double shock for them. Perhaps they expect a Bantu language with their backward thinking, I don't know. Although I can't tell the difference visually, my fiance says that many of these people with these reactions here in the East are predominantly Russian immigrants. If I decide to stay here and find work, we are moving to Western Berlin faster than a lightening bolt.
I believe that a Euro-American would have no trouble here. Actually, a few Euro-American students I have talked to love Eastern Berlin, their clubs, and hangouts. Most of these are the left leaning or more Bohemian Americans like myself. However, I am Black and that puts me in a particular element of intolerance and exclusion here and has given me a horrid experience in these parts. I don't think they are intolerant of the English language as someone stated before, especially when spoken by a White American. I think you will be okay. Their intolerance seems to rest upon how much melanin you have in your skin.
Good Luck.