Marieke's place matches the description and the photos and I would definitely stay here again. She has a great place.
She has turned an old barn into very nice, spacious accommodation with thoughtful attention to detail. For example, the bathroom heater is on a timer to ensure the bathroom is warm when you get up in the morning.
As Marieke notes, the barn is out in the countryside with plenty of walking paths, canals, and parks nearby. Equally, it is just a short drive to Rotterdam, Delft, the Hague, etc. It offers the best of both worlds - peace and quiet, and accessibility.
The barn can be heated by central heating/radiators or by a wood stove. I highly recommend the wood stove. There is plenty of cut wood, it is easy to start a fire and it warms the barn very quickly. It is also more eco-friendly than the diesel that runs the central heating.
As Marieke notes, the barn offers wireless internet and it works well upstairs in the living areas for checking email, social media, etc. As one might expect out in the countryside, the internet speed is not the fastest.