Christofoor's apartment is located in a lovely area of Amsterdam, just a few minutes' walk to the tram line that will take you to/from the airport and the city center. Everything was very clean and though we only chatted with Christofoor briefly, he was very friendly. For anyone arriving from the airport and passing by the RAI station to get the tram to the apartment, try to make sure you have cash on you. We had a lot of trouble trying to use our cards in the machines!