The good news:
-The apartment is very nice and clean
-It's very easy to get anywhere in Berlin from there by train/tram

The bad:
-We had a bit of a bad experience right off the bat. They want you to call an hour before you check in. That's a little inconvenient, but I guess it makes sense. We were driving and didn't have a cell phone, so had to spend forever looking for a payphone. When we finally got in touch with Alan he said we had to call again when we got there, even though we explained to him we didn't have a phone. So we had to find a payphone when we got there which added more time and expense. It turns out, they live in the same building as their airbnb place! Why didn't they just have us buzz them at their apartment? This whole ordeal resulted in us missing the concert we wanted to go to that night. I guess the moral of the story is, don't stay here unless you have a cell phone that works in Germany.