Julius's apartment was perfect for my overnight stay in Brussels and he was very accommodating in letting me check out later. We never met, but communications were prompt.
Don't be put off by the entrance to the apartment, or the two flights of stairs - these might be tricky with heavy luggage. The apartment itself was comfortable.
It is located in a lively area, with lots of bars nearby - although one doesn't really hear this as room faces inwards. Hire a bike and explore Brussels! There is a really nice restaurant nearby, Fin de Siecle, 9 rue des Chartreux which I would recommend. It serves great food and is open till late.