We really enjoyed our stay at Lena's place. It was incredibly clean and neat and the bed was very comfortable. Lena was really nice, very responsive over email, and flexible about check-in. The location of the apartment is amazing. We felt very safe walking around the neighborhood, even late at night. There were so many great cafes, bars, and restaurants around too and it's very close to the train. We would recommend to future guests to find out in advance how to get into the building initially as we had some trouble and had to call since the address did not include an apartment number. Also, one of the nights we were there it was very cold in the apartment and we had trouble sleeping. I don't know if there is a way to control temperature but this would be something to discuss with Lena, especially if you're coming in the colder months.
Overall we would recommend staying here and would definitely stay here again next time we're in Berlin. Thank you Lena!