Don't hesitate to book this place. Henk's cottage is one of the loveliest AirBnB's I have ever stayed in. The Dutch countryside must be experienced and this is the best place to do so. The atmosphere is bucolic and scenery idyllic. In my week of European travel, this was the best place that I stayed in and definitely the highlight of my trip. It is about a 20 minute ride from Schipol and close to public transport routes if you want to go into Amsterdam Centraal (there's a bus stop in front of Henk's place that you can try, but you'll have to transfer. Or take a 15, 20 minute walk down the country lanes and pick up the bus that goes directly into the city). Take advantage of the bikes that Henk freely lends and explore a little of the countryside. There is also a binder/book chock full of recommendations of where to go and how to get there and places to eat that was very useful. Don't miss out on the wonderful breakfast or just sitting outside on the patio, taking in the views in front of you. The whole experience was a breath of fresh air and I will definitely look into staying here again next time I find myself in Holland.
(And, as this is The Netherlands/Amsterdam - don't forget your umbrella/rain jacket :).)