I stayed at Kenneth's studio for four nights.
In a word, "perfect."
Perfect location with Vondelpark as its "backyard". Tram stops close by on the main street with only a few stops to the center of things (I mostly walked, though!).
Perfect studio with all the amenities and more (beer and wine, cookies, transportation card, lots of info. on things in the area, etc.).
Perfectly attentive host – Kenneth – who is also very communicative and generous (I needed both an earlier check-in and a later check-out, and Kenneth agreed to it instantly).
So if you're in Amsterdam, traveling alone or with someone you love, this cozy studio is undoubtedly your best choice. It's mine from now on.