Daniela's apartment is in a perfect location, near Potsdamer Platz. If you rent a bike you can easily visit Kreuzberg, Neukkölln, Mitte and Tempelhof. The street is very quiet, there are many cafés and small restaurants in the neighbourhood. The wonderful Gleisdreieck Park is around the corner.
The apartment has a large office space / living room, a small bedroom and a separate kitchen, which is simple but functional.
Daniela is a good host, she communicates easily and responds quickly. I would certainly stay there a second time if I visit Berlin again.