If you are a family or a group of 4 friends, don't hesitate to select Joost and Charlotte's apartment.
With its 2 levels plus the terrace, it makes each one feel independent.
The terrace is amazing in hot weather, and the location of the building makes things easier : food store just downstairs, bus stop round the corner,park for birdwatching half a mile away, and Central station within a short radius to visit all the surrounding cities: Haarlem, The Hague , Delft and many others.
If we come back to Amsterdam, be sure we'll ask Charlotte and Joost for accommodation.
I didn't say a word about the facilities inside the apartment because it was just perfect, and Charlotte is a perfect host too !