Frido's place was spectacular! The flat and the location can't be beat.
The flat consists of a large airy double parlor for living/dining, a well stocked european kitchen, a very large bedroom with 2 single beds, a small sleeping room with a queen bed, a balcony, and a large entry area. We stayed 11 nights and appreciated having a nice place to hang out when we weren't running around. The flat was notably quiet especially at night.
The location is fantastic! The street is quiet with few cars, many dining, drinking, and shopping options within a couple blocks, good public transit options (like most of Berlin), walk to Mauerpark for the Sunday flea market and music performances. You see lots of families with small kids in the neighborhood.
We would absolutely stay here again - its all around charming!