We had a really good time at Wanda's apartment. Wanda was very helpful and answered quickly our questions via Mail. Unfortunately we didn't meet her in person but her very friendly mother welcomed us.
The location is pretty cental and almost all sites are in good walkable distance. We also liked the nice cultural mix of the neighbourhood. Some good vegetarian restaurants are not far from the apartment as well as organic store and many, indian restaurants. We liked the "Raja-Mahal" (actually pakistani) the most. It was the first "indian" restaurant in the area and the stuff was the most friedliest and no hassle at all. It is the last on the right side after the Metro-station coming from the apartment.

The apartment is simple but clean and quiet (not facing towards a street). You have everything you need for a good price. It would have been fantastic if the mattrasses had been better.
We will come back the next time.