I picked the apartment because of its proximity to Gare du Midi to ease our transfer from the Charleroi airport and train journeys to Brugge and Lueven. In fact it was very convenient to stay just five minutes walking from the station. Simultanously it was a quiet and safe location. The apartment itself is quite comfortable. We enjoyed staying there.
This is the only negative note I have: When I sent a question to the owners before booking, I got an immediate response. When I did it some days before arriving to clarify the address, they answered only two days later. I do not know whether it is a normal practice but I find it a bit strange.
I can definitely recommend the Kristella & Francesco property for a stay in Brussels.