We spent 3 days in Christopher's place and everything was perfect!
He was so welcoming and helpful. He gave us so many good advices and we felt like home.
We took time to talk to each over : he is open-minded and he took care to speak an English easy to understand! :-)
His appartment is definitely charming and light.
By tram, Amsterdam is pretty close and it's possible to come back home by feet too ;-)
From the airport, you only need 30 minutes by train and there are direct trains : so easy!
If we go back to Amsterdam, we will contact him for sure!
Thank again Christopher