For anyone in the slightest interested in architecture and/or design this is a must go to if you ever stay overnight in Rotterdam. This is one of the iconic cubic houses and in much better state and better decorated than #70 (open to the public). Plenty of light, spot on furniture, the tilted walls, it is all very special and remarkably comfortable. You immediately feel at home and are sad to leave so soon.
One the negative side just the fact that you are in the centre, and therefore subject to the fuss of a busy city. Neighbours are noisy and loud music entering the house from the outside goes late in the night and starts early in the morning. However, it isn't bad enough to prevent this place from getting the 5 stars.