Perfect room and perfect family. Daniela and Daniel are the perfect hosts. Really recommended place to stay. The room is well fitted. The fact that the bathroom is downstairs was a bit strange for me at first but I got used to it. Especially that I need to use it at night and only Pius (the black cat) is awake by that time so sometimes he scared me 😅. (Not his fault of course he is a really cute and friendly cat)
As for Charlottenburg I do not recommend it for short stays that are less than a week. Personally I would prefer staying in Mitte. But if this is your 2nd time in Berlin or you don’t need to do sightseeing then do not look any further.