The apartment is stylish and convenient. The beds were comfortable and the kitchen is nice. The neighborhood is lovely and quiet - right near the zoo and very walkable to the major sights. We walked everywhere during our visit, though there is also a tram stop just around the corner. But it was nice to be slightly away from the busiest tourist areas.
Joost was always quick to respond and check-in and out was very simple.

Be prepared that the stairs are very steep, sort of halfway to being a ladder, which might be an issue with young children. The only real drawback for us was that the apartment felt as though someone had cleared out in a hurry without finishing the job of getting ready for guests. There was old food in the fridge, coffee cups in the sink and trash in the bin. And cigarette lighters everywhere (though no smell of smoke). Otherwise it was clean and there were fresh towels and sheets.