The previous reviews are accurate. The apartment is in a great location if you want to stay in the old city. It is centrally located around many bars, restaurants, shops and the grand palace. Because it was centrally located it was a bit noisy at night. This apartment was on the 4th floor accessible by a tight spiral staircase so make sure that works for you. Lastly, just as an FYI, this space is rented through a company, which didn’t pose any real problems but wasn’t our usual, personable Airbnb experience. They had strict rules like you will be charged a fine if you move furniture.
Overall a great place to sleep and store your things in Brussels!