Although we never met Lena, the communication was very good. She sent both text message and e-mail if everything was fine and if we needed anything. We had a late flight back and was able to borrow the apartment for longer than we might expect.
The location could not be better: close to U-bahn, close to Bergmannstr. The apartment is located in a quiet area and we never experienced any noise. A big plus is that there were no surprises when we arrived at the apartment. The pictures posted at Airbnb are accurate (+ for best WiFi and nicest bathroom we've experienced). We really recommend this apartment and we could not be happier with the host.