Ingolf and Igor's place is spotless. It's not huge, but they have been thoughtful in making good use of space. The bed was comfortable. And there was a good amount of storage space for guests as well.
The neighborhood (kind of smack in the middle of Charlottenburg and Halensee) has everything you need in just a few steps: good public transportation, shopping for basics, luxury shopping, restaurants of all types, and great walking.
I had a wonderful time there. It was a fantastic Berlin "home."