We got way lost, meaning that Google Maps lead us to Harlem, which is a place outside Amsterdam. Since I has never been there, I just assumed it was a region of the city as in other places. Apparently multiple street in more places can have the same name. Thomas was chatting with us at 12 AM trying to get us on track. He also found a way to make sure we would find the keys, as he was not able to wait for us so late. During the last day, he changed the cleaners' schedule to enable us to sleep in. I fully recommend him as a host.
The apartment is nice and spacious. The location is also advantageous if you are willing to pay for the train (there is probably a subscription that I was not aware of).
All in all, great trip!