Ferry & Annette’s place was an excellent base for an exploration of Amsterdam. It is a comfortable (though not short) walk to the "Centrum", and there are ample public transport options.
The room is like a very small studio apartment, including a private shower, and was quite comfortable.
There is a touch of road noise, but not enough to cause problems, I would imagine, for anyone other than extremely light sleepers.
Annette was very helpful, and couldn't have been nicer.