My girlfriend and I spent 4 nights at Arjan and Francis' place and can very much recommend it. Expectations were exceeded:

Central: Arjan's apartment is located very central with just 5 min walk to Leidseplein, but also easily reachable from the airport (direct bus) and central station (direct bus and tram).

Quiet: The long ground floor guest room is split by a sliding door, and the bed is in the back, such that we were not troubled by street noise at night.

Friendly host: Arjan welcomed us at 10:30pm on a Friday (flight got delayed). He prepared breakfast for us the next morning. He hung the hammock for us on the terrace, when we came home from a day full of sightseeing.

Thanks for letting us stay! :)