GREAT hosts. (The rental is basically a room of their apartment, but with a totally separate entrance. Total privacy, but also quick communication with Etienne and Judit, who are very nice.)
I was traveling alone with a grumpy 3-year-old, and Etienne and Judit shared kids' toys, which helped keep my child occupied.
Place itself is as described in ad. Quite small, but a nice location, quick to trams and right between Friedrichshain and Prenzlauer Berg.