It is on the second floor, accessible from the Millennium court by elevator or on stairs, and also from outside, from Semiramis roof garden.
It is open every day from 11.00 am to 19.00 pm. There are two separate rooms with baby changing tables and armchairs, and it is also possible to heat up the baby food.
It is for free, so it is a good opportunity to get a calm moment with the child (only one child and max.2 adults are allow to be in the room in the same time).
But if you only need a place for baby diaper change, there are more options:  In the toilet at the underground level (close to the P3 parking level entry) and in the Millennium court, at ground floor and first floor levels you can find toilets with baby changing tables.