If you are looking for the quietest house in Brussels, then I would recommend the house of Elodie.
The neighborhood is very quiet, the people are friendly, and the transportation is convenient. And also near the park, kids cute neighborhood.
Above all, the house was most liked.
Spacious and clean, the stay was very comfortable.
And the house has a very important element that it is the cat Illy.
Illy was very friendly and likes people.
So our family spent a very good time in Brussels with Illy. ^^/