Location, as they say, is everything, and Marc's apartment is in a great place, an beautiful neighbourhood steps away from the busier city centre, but still maintaining the local character. The building itself is quiet and the unit is simple and comfortable, feeling like it is a part of the city. To the degree it is costly, it is because of where you are, but you won't do much better then this to spend some days exploring beautiful Brussels.
Host's have easy and simple instructions and getting in and out without difficulty was no problem at all. I would gladly come back.