As many reviews have said, the location is excellent. Chipsy King and Samrat are both right outside the apartment and are delicious quick/lazy meals. Furthermore, the third floor bedroom was very clean and cozy, with a sink in the bedroom (nice for brushing teeth in the privacy of your own room). Two towels were provided, which were much appreciated for showering. The wifi was functional (not fast, but functional). There were some silverware / dishes provided, although the kitchen is not included in this Airbnb. The windows open right out into the alley way, which is a fun feature.
However, some caveats: There is a strong cold draft that comes from the windows, which was uncomfortable for the person sleeping closest to it (it was around 50 F / 10 C at night while we were there). Noise from the streets / folks eating downstairs is pretty noticeable, but at the same time I don't blame the host for living in such a central location — just definitely bring earplugs, if you're a medium to light sleeper. Also, the lock on the bedroom door did not turn fully and therefore we could not lock our bedroom door unless we were literally inside the room. Most notably, the bathroom conditions were less than ideal (the toilet and shower are mildly inconveniently located on the 2nd floor, between the 1st floor and our 3rd floor bedroom) and could be improved dramatically with more access to toilet paper (it unfortunately ran out on one of the evenings/mornings) and shampoo (the bottles were totally empty). The bathroom is also not the cleanest / freshest smelling (think mildew), although I know the hosts are limited by the conditions of the average central Amsterdam apartment.
Finally, as many other folks have stated, the 2 flights of carpeted stairs are surprisingly precarious. I know that this is yet another charm of homes built in this area of town, but I would caution strongly against staying here if you have any form of strength / mobility limitation. I am fully mobile and still felt that dragging my suitcase up the stairs was arduous and precarious.
Overall, I'm grateful for Derya's hosting and think that we generally had a decent experience — it's certainly a good budget find, considering the location and the authenticity of the Amsterdam apartment-living experience. However, if I needed a place for more than 2 nights, I do not think I would choose stay here again.