Really lovely apartment. We would go back again if we ever visit Rotterdam again. Manon and Manfred were very friendly. They are very quick at responding to any questions.
There are two toilets and showers. The bedrooms are located in the basement and the stairs are very steep, but our children managed it fine. Very family friendly house.
The neighbourhood is very quiet. Walkable distance to the central train station. Shop nearby to buy groceries.
The only warning I have is to be equipped with bug repellant spray. A lot of mosquitos in the summer. There is a chemist in the central station.