Since the three rooms lead out into an alleyway, it is relatively dark. In order to enable as much daylight as possible to enter this building – not originally connected to the house owned by merchant Jan Hartman – large windows were placed near the front door when it was built. Since its restoration, the lighting in the rooms has been recreated in the style of the Golden Age. In addition, several layers of paint were very carefully scraped off the window frames and ceiling in order to identify the original wood colouring in this part of the house. The researchers revealed dark red and dark brown pigments, which can once more be seen here today.