Me and my cousin had a lovely weekend at Brussels. Antoine's flat has the perfect location to explore the city. The area is always busy, though not noisy at night, and we felt safe at all times. It is located 5 minutes walk from the central station, 3 minutes walk to the Grand Place and 1 minute to the Galeries royales (where you can find all the great chocolate shops). The flat itself is flawless! Superb decoration, impeccably clean and so comfy! As said in other reviews, it actually feels like you are staying in a really nice hotel.
If I ever go back to Brussels I would definitely stay at Antoine's place again :)