NO WIFI
Affordable small apartment located 5 minutes walking distance from tram and 10 minutes walk from Metro. Marek was responsive and answered all of my questions. However, there was no WiFi, the bathroom sink leaked, there were lots of personal belongings, and the apartment was semi-dirty (the bathroom had hair on the walls and the sink leaked; the bedroom walls had dirt stains next to the bed; the dishes and utensils in the kitchen were dirty). As others mentioned, there are steep stairs that link the three floors, but after the first few days you get used to them.
Overall, for what we paid the apartment is cozy and has all the necessities (minus WiFi) that you would need for a week in Brussels.
Note: Avoid North Station at all costs at night, ESPECIALLY if you are a woman (located 15 minutes North)