This was one of the most amazing AirBnBs we've stayed in and we are well traveled! If you want to experience the bustling, energy of Brussels the location can not be beat. It is RIGHT on the Grand Place and down a classic cobblestone lane. It almost feels like it's too good to be true. Views are breathtaking from every window.
When I say bustling, I mean bustling! It's loud and full of good cheer. The building is old, which we loved, but that does make it less sound proof. The Grand Place is busy and popular for young people and tour/student groups so there is pretty constant noise until pretty late at night. There are ear plugs for light sleepers which helped some, but we still enjoyed every minute. If you want quiet, calm stay in a new, sound proof hotel. We were looking for the real downtown Brussels experience and got it.
Another note is that you have to walk up many, many stairs to get to the top floor flat so if you are physically disadvantaged, it may be difficult. We LOVED it.