I was actually in Den Haag for a conference at The World Forum. The location of the Marleen's place was great; it was about a 5 mins or less walk away from a tram stop that conveniently brings you to and fro to the central train station in Den Haag. And it was about a 10-15mins walk to The World Forum.
Marleen and her husband were great hosts. It was so nice of them to even worry for me when I didnt make it to their place at the time I mentioned I would. And they respected your privacy even though they were living on the floors below. I was also truly appreciative of how they dealt with one of my concerns of the room.
I loved the room; it was really really big and spacious and the bed was super comfy! Everything of their place is true to the pictures in the listing. I would highly recommend this place if you are here for a conference at The World Forum or just basically to get an experience living in a house of the locals here in Den Haag.
Points to note though are that the floors creak when you walk and that the stairs are quite steep (both typical in such olden houses) so try to avoid packing big and heavy luggages.