Roel is a fantastic host. When we arrived at the windmill, we visited a bit, chatted about the windmill, and he gave us a tour all the way to the top. Once we got settled he showed us the electrical pump, as there was no wind that day to run the windmill itself.
The room has a lovely view, and Roel left us a wonderful breakfast the next morning. Our only regret was not being able to spend more time there!
If you're looking to get to downtown Amsterdam, I'd recommend an Uber. We tried walking to the train but ran into some confusion when we were told we would need to purchase a $7 card for each passenger, then add value to it to ride the train. An Uber ended up costing less than $20 and made life quite a bit easier. We may have misunderstood the train situation, but just found the Uber to be a simpler solution.
All in all a great stay, and a unique experience you won't get anywhere else!