Let me start with the conclusion: if I could give Sander and Sander's place 6 stars, I would. If you plan to stay in the center, this should be on your go-to list.
We were a group of 3 that needed a last-minute booking for the weekend. Sander responds almost instantly and while we saw the pictures, it is always tough to know exactly what a space is like until you get there. Upon arrival, the first and most important thing: the place is newly renovated, spotless clean and the spacious layout makes you feel like immediately hanging out at your new home (rather than actually checking out pretty Amsterdam!). Also, the location is par excellence; dead center but still on a quiet end of the street, literally minutes from Van Gogh, bars, cinemas and other attractions.
The apartment itself has two floors (top for living and bottom for sleeping), very sensibly laid out so 4 people can easily be accommodated. Sander stocked the fridge with drinks which was an amazing touch. He also has recommendations for basically any attractions in the city, having lived there for so long. Super helpful also with an item that I forgot after checking out!
I could go on, but all you need to know is that if you want to stay at a place in Amsterdam's center that's beautiful, clean, well-situated and has that rare thoughtful host, book here. Any price above the average is deserved.