The apartment was fantastic - we had a great time there. It is very well situated in the centre of Brussels and near some lively areas (Dansaert, Halles de Saint-Géry). That said, the street it's on isn't noisy or crowded at all.
The place was beautiful, spacious and cosy at the same time. It looks better than in the photos! It was very clean and the kitchen was extremely well-equipped. The terraces were adorable. There was lots of shelving and cupboard space, with empty shelves (as I think no one permanently lives there).
Highly recommended and would definitely stay there again!