We spent two nights in Youssef's apartment. It's close to the center of Brussels, I think it's around 15 minutes slow walk. And it is very easy to access from the train station. However, just remember to check with Youssef his door bell before arriving:)
Youssef and her girlfriend are very nice. Youssef recommended many places in Brussels and we had good time there.
We recommend Youssef's apartment!