I guess it is because of the timing for your visit. Maybe It is the nap period for the daycare.
The first daycare of my baby was at Amsterdam. It prefers most kids to go to sleep during 1 to 3 pm. So I also feel it is especially quiet when I was there during that time period.
The current daycare does not prefer that fixed sleep duration in the day. So it is not that quiet. But you may feel bad if your baby prefers to sleep during 1 to 3 since it may be more noisy. :)