Grunewald is a locality within the Berlin borough of Charlottenburg-Wilmersdorf. Famous for the homonymous forest, until 2001 administrative reform it was part of the former district of Wilmersdorf.
Next to Lichterfelde West, Dahlem and Westend, it is part of the affluent Berlin "Villenbogen", a row of 19th century suburbs completely made up of mansions.
Wikipedia https://en.wikipedia.org/wiki/Grunewald_(locality)
Coordinates 52°29'14.451" N 13°15'49.514" E