Flat is well location in friedrichshain. Lot's of restaurants around so are the subway and market. The key box is really usefull when you are several visitors.
The flat is ground floor and you have the filling to live with the neighbours.
The only negative stuff is the late check in (16:00) and early check out (10:00) that are clearly not possible to be negotiated. It is really sad because Berlin nights are long 🙂!