We really liked the apartment, it is very clean, modern and spacious, and had everything we needed.
We did find we lacked a little privacy as we believed we were renting a private flat, and realised when we arrived that it was not a private apartment but the second floor of a house, the first floor of which was occupied by the owner and her family. Whilst no issues arose from this, we lacked privacy and felt concerned we were bothering them every time we came in and out of the house or when we felt we were making a little too much noise.
Overall however we had a very good experience and were very grateful that Willemijn let us keep our luggage in the house past checkout time so we could visit Amsterdam comfortably until later in the day.