Museum Willet-Holthuysen

The house was built for Jacob Hop, mayor of Amsterdam, around 1685. He was not the last mayor to own the house. In 1739 the outside was redesigned to look as it does today, in the then fashionable Louis XIV style. In 1895, its owner, Louisa Holthuysen, bequeathed the building and its contents, including the art collected by her and her husband, Abraham Willet, to the city of Amsterdam on condition that it became a museum bearing their names.
Three floors are open to the public, the souterrain, with the kitchen and garden , the first floor , and the top floor, with one bedroom on display and rooms for exhibitions. In the blue room, several paintings on the walls show previous owners . In this room there are also several decorative paintings by Jacob de Wit, though these have been sourced from other buildings in Amsterdam. Decorative pieces by Jacob de Wit were at some stage in the house, but previous owners took them with them. It is not clear if some of the current Jacob de Wit paintings are 'back home'.

Wikipedia