Eli's apartment is a wonderful old apartment with the most amazing high ceilings and stucco. The apartment is full of light and is always clean. It is very well connected to public transport (busses, U-bahn and S-bahn!), so you're only 10-15 min away from anywhere in the city centre. However you can hear the train inside the apartment, but this did not disturb my sleep in any way. The area is generally very nice as well.
I enjoyed Eli's company the two weeks I stayed with her. She was always super friendly, inviting me to join her for lunch, while still respecting my privacy, when I was in my room. I feel like I made a new friend :) I would definitely book this room again and will for sure recommend it to anyone going to Berlin.