We had a great stay in John & Ceca's apartment. The location is absolutely perfect for a city trip: in the middle of the city center with everything you need within walking distance. The apartment itself is very nice. Eventhough it's in the middle of the city center, it's very quiet and good isolated. One thing to keep in mind is that you have to walk 3 stairs up and down.
I would recommend everyone to book this apartment for your city trip to Brussels!