Juul's home is indeed spacious and comfortable! We (me, my husband, and 18 month old son) stayed here a week. There were tons of books and toys for my son to play with, and lots of space for him to play in the living room and in the toddler bedroom upstairs. There is a nice bathtub with lots of bath toys too. There is a baby gate at the top of the stairs, a high chair, and lots of baby cutlery. The garden is beautifully done and quite spacious as well. The house is a perfect distance to Centraal Station (10 min walk through a park) in a quiet neighborhood. There aren't too many restaurants in the immediate area, but the Blijdorp subway stop is close by. Juul was incredibly accommodating to all our requests and very responsive via text for any question or need.
The room where my son slept had dark curtains, but I was glad that I brought my blackout shades from home to make it darker. We weren't able to get the heater going (as we stayed in early autumn) so had to bundle up the little one to keep him warm at night. The bed in Juul's room is quite comfortable too. The stairs are not super steep (for Dutch standards) but they do have a curved part. The kitchen was well-stocked and everything worked perfectly.
I would highly recommend Juul's place for a family with young kids. It's a perfect house for this. You'll have the space and the comfort you need, not to mention the sunlight (hard to find in Dutch houses)!