Loved the view from this studio - the large windows let in a ton of light during the day. Nicely decorated, and the bed is very comfortable :) I slept very well. Check-in was easy and Jean is very responsive and friendly. We didn't meet, but Jean made arrangements for me to pick up the keys when I arrived, which I really appreciated. The apartment is pretty large, and there's plenty of space for one person to relax. It's located next to a main highway so you may hear sirens and traffic (mostly blocked by the window), but well, it's a city.
The apartment is conveniently located next to Bruxelles-Nord and the 2/6 metro, and the Sainte Catherine area is a short walk (that ended up being my favorite place to wander - a lovely area where people have drinks food outside in nice weather). It's a longer walk to the Grand Place area, but unless you use an electric scooter (and there are plenty lying around for rental!), you'll probably have to walk from wherever you come from in the city.
For tall/large people: The toilet might be small - I'm short and the door closed in front of my knees.
Overall: Recommended, especially if you're planning to be out and about most of the day. I had a nice time here!