We had a fantastic three nights at Ann-Charlotte's place. Private, quiet and well setup, we could have easily taken double the number of people. Stacks of kids toys, good comfortable beds, Netflix on two TVs, loads of tips on what to do in the area and how to go beyond, a well equipped kitchen, strong shower, washing facilities all as stated or better.
I'd say this place is definitely more than the sum of its parts and a great family base from which to explore Brussels - just a shame our stay was timed so we didn't get to meet Ann-Charlotte in person, though she was still tirelessly responsive from wherever she was vacationing.
Brilliant. Would definitely recommend.