Koen was an excellent host. On arrival, he told us everything we would need to know about his apartment and offered assistance and advice about Amsterdam.
The apartment itself was spotlessly clean and stylishly designed. It was the perfect size for two people and what you see in the photos is exactly what you get. The apartment is also well-located for public transport (even though it's quite near several sites including Anne Frank House) and has some lovely restaurants and pubs nearby. We would definitely stay there again.