Jan made us feel extremely welcome when we arrived giving us a load of recommendations to eat and drink etc based on what we were looking for.
We'd 100% stay there again! The pictures are extremely accurate, and it has all the mod-cons you could ask for. The soundsystem is particularly great (and of course, the coffee making set-up...).
We'd recommend getting bikes while you're there. The flat is 5/10 minute ride into town, and generally, bikes enable to you get the most of all the different parts of the city...
Amsterdam is a beautiful city, and Jan's is an enviable place to call your home.
If you get a chance, check out the guy in the market selling teriyaki steak baguettes...