Great accommodation, great host, great city!
My wife and I recently spent 6 days in Amsterdam for our honeymoon and we stayed in Martine's fantastic accommodation. Communication with Martine was a breeze and we had no trouble at all checking in and out. She provides a detailed list of fun things to do around the city as well as makes herself available (within reason) for any questions you might have during your stay.
The apartment itself is beautiful and spacious with everything you could ever want or need. The rooftop patio is large and provides a unique view of the the area, sadly the weather didnt cooperate so we werent able to take full advantage but in the summer this would be AMAZING. The location is central enough that you can walk basically everywhere but also not right in the heart of the busy tourist areas.
Don't hesitate to book this spot, it's perfect.