We got everything we asked for and more. Santiago was very friendly and willing to help us with whatever issue we might have had, and accomodate our every need (such as our late check-in and check-out, tips regarding the city and other beautiful places to see outside of Amsterdam etc). We got lucky in a way, since Tony was out of town and Santiago spent little time at home, so we had most of the apartment to ourselves (not that it mattered, since we spent very little time 'at home' besides sleeping. Still, it was nice not having to worry about being fully dressed when going to the bathroom and so on - but don't expect this to be the norm, you're sharing an apartment with the host after all.
The room itself is spacious and cozy - the soft, king-sized bed near the big windows being the centerpiece of it. There's also a TV that we ended up never using and shelves packed with touristy fliers and information pamphlets for a lot of the attractions in the city. Santiago himself was kind enough to show us around on the map and give us tips about public transport and places to see outside of Amsterdam (such as Eden, Zaanse Schans etc).
The kitchen had everything you need for preparing a quick meal - two different coffee machines, a toaster, a microwave oven and, of course, an actual oven. Neither me nor my partner make any pretense of being anything even resembling a cook, so we mostly heated up or toasted stuff or straight-up ate out - but Santiago did provide us with cheese, OJ and some eggs for the self-service breakfast and that was appreciated. There's a rather large supermarket nearby called Dirk where we did most of our grocery (and snacks) shopping that had a plethora of freshly-baked croissants, pains ou chocolat, waffles, yoghurts and so on that we feasted on for breakfast. Cheaper than Albert Heijn, too - and the view from the apartment's outside terrace rivaled even the best-placed cafe's we've been to.
The neighborhood itself is very quiet and peaceful, a calm residential area. Stepping away from the city center legitimately feels like walking into another city the further you go. We were very surprised by the contrast between the noises and lights of the nightlife in the city center (especially in the red light district) and the tranquility in our neighborhood. Being a mere 30 min walk away (and at a slow pace at that!) from the DAM square meant that as soon as we got tired of wandering around the city and were ready to call it a night, we were able to retreat and disconnect from the noise, which proved invaluable to our enjoyment of the city and of the trip as a whole. There's not much more you can ask for than being able to sleep peacefully after a long day's walk.
To wrap it up: this was me and my partner's first time using AirBnB and we're fairly certain we ended up getting a much better deal than if we had gone to a hotel. It was a more personal experience and it certainly boosted our overall impression of the trip from awesome to even more so.