We stayed at Thomas and Aletta's house with two boys, 4.5 and 2. The house was perfectly equipped for them and for us! Lots of toys and we appreciated that there was a travel cot on hand. Bed in master bedroom was very comfortable and the living space is very pleasant. It was very hot when we were there but the apartment was very cool/pleasant temperature. The street is really beautiful and quiet.
The location of the apartment is perfect for a family- literally steps from the park which was amazing. The park is wonderful for children- we didn't even go to the same playground twice! And the paddling pool was great for a very hot day.
We walked (with a buggy and a scooter) to the Van Gogh museum which was a very pleasant stroll through the park. There are nice coffee places near the flat which we also enjoyed.
Communication with Thomas was very straightforward and he was readily available to answer any questions. Aletta greeted us on arrival and explained anything we needed to know about the flat.
Overall, highly recommend for a truly memorable family holiday in Amsterdam.