I stay in Berlin a couple of times per year (usually for a month or more) and I love this neighbourhood! Bergmankietz is easy going, hip, and is close to a an U7 ubahn stop. I had an airbnb host cancel my reservation and found that Ben's place had a couple of weeks open, so I booked. Upon arrival, the place was very clean. It was a really hot 2 weeks, so it was nice to be in the basement. I kept nice and cool there. Ben responded quickly and also gave me recommendations for a couple of restaurants. The only thing I would say is that the bed isn't as comfortable as it could be. It's a bit saggy in the middle. Other than that it was a good place to base myself.