This is an excellent apartment in a nice location. it's walkable into the centre of Amsterdam, but I'd recommend getting a pass for the trams if you're going to be regularly going into the centre. The room was very warm, which wasn't an issue for us at the time of year but I imagine could be uncomfortable in the summer.
The biggest issue was check-in - we were told to meet at a different hotel 15 minutes walk away to collect the keys and after having said that we were arriving early, this hotel was shut (despite being told we could leave our bags there). We returned to this location at check-in time and the keys were still not available as the apartment was still being cleaned. We were then told by the person behind the desk to go to the apartment and get the keys from the cleaners which weren't ready until well after the check-in time. Communication with Kate was very poor with ignored messages and calls, but she was very responsive for the rest of our trip.