I had a lovely stay at this apartment! I was in Brussels for a vacation and the apartment is well-connected to public transit and is close to the city center. Getting to the usual tourist-y spots was very easy. As an added bonus, the Parc du Cinquantenaire is a 10 minute walk away and is a beautiful park to hang out in.
The apartment was very clean. The washer and dryer in the unit were quite useful. All the other amenities together made for a comfortable stay. My only issue was the heat in Brussels when I was visiting. The unit lacked a fan, and while I was able to open the windows to combat the resulting heat, the noise from outside was a mild disturbance at night.
Would recommend this apartment regardless for all its advantages, and I would say staying here is a no-brainer if it's cooler in Brussels or if there is a fan in the unit :)