Can't recommend this place highly enough. The location is unbeatable - right next to Rosenthaler Platz, which is in the heart of Berlin, so it was very easy for us to get around. Toni's place is in a private apartment building, so the convenience did not come at the expense of peace and privacy.
The apartment was warm and spacious. We especially liked that it was well lit and came with a ton of power points.
Toni and her husband were both extremely friendly and helpful. They proactively sent us detailed instructions on how to get to the apartment from the airport, and they were there to receive us when we arrived. Thanks again, Toni!