Walter and Kalina sent me a very inclusive email about a week prior to my arrival. It had everything from wifi access info to a list of their favorite local bars and restaurants. Fortunately, I've been to Amsterdam a few times before and I know a few local spots as well, but I'm always willing to entertain a local's suggestion.
My stay was only 2 nights, but I was definitely comfortable in the apartment. To access the apartment, you will need to walk up about 20 very very narrow stairs and if you have luggage, this may be very difficult, so be prepared. Aside from the stairs, the apartment has all you need, as seen in the photos.