As a solo traveler, I found the city to be very safe. I spent 2 days in Brussels and for me 4 days would have been more than enough to comfortably experience this city. Brussels is busy, clean and by my standards safe. Public transportation is very efficient and another nicety for me is that most folks speak English. I actually walked most of the time and didn’t take the metro, trams or buses.
See my full report below.