We stayed in this houseboat for four nights in Feb/March 2011. The houseboat has the two bedrooms at each end, which means that the living space is very spacious, bigger than many apartments. The bedrooms are both quite small, particularly the double bedroom.
The stairs down into the main houseboat are more like a ladder, which was fine for us, but wouldn’t necessarily be fine for everyone. The boat has a washer, dryer, dishwasher, and very impressive oven (which we couldn’t figure out properly during our short stay). The kitchen is very well equipped, better than I expected. The internet connection was excellent (although was not wifi, you needed to connect a laptop).
It was only just warm enough for us (although we are from Australia), I suspect that if you were in Amsterdam during a seriously cold spell (days below zero) you might find it too cold.
The boat is very centrally located, walking distance to anything, and you can use the metro and the trams if you don’t want to walk too far. It is two minutes walk to the nearest metro stop, which makes it very easy to get there from the train station.