This apartment is spacious and well (or even excessively) equipped. The functional Yamaha piano in the living room is a rare find, along with an elliptical machine in the unit. There is an extra desk/printer/lamp in the bedroom, which can be helpful as a dedicated work area. Wifi is super fast, compared to many other Airbnbs or hotels.
The apartment itself shows ages. It's dimmer, and has wear and tear at different places, with some minor cosmetic difference from the pictures. Eg. The kitchen area is painted blue. None are big deals.
The location is in a very very quiet area. It's near the shared edge of Sint-Jans-Molenbeek and the City of Brussels. To give a general idea, Grand-Place is 20+min walk away and it takes similar time if want to take public transit, according to various Maps apps. The area is very residential, so not much going on at night and food options are relatively limited. I would recommend enjoy the good restaurants in the city and taxi back at night to make the most out of your days, if you're a tourist.