I would highly recommend this place! I was 6 days in Brussels in order to find housing and it really is a good place to stay at. It's a very calm house in a quiet street. I was there with 26 degrees and although it gets a bit warm (4th floor at the roof), once you open the door and the window at the stairs it can air through and it's very well doable. The house is an traditional old Brussels house, so it has high ceilings, many stairs and wooden floors. In the room itself there is actually a water cooker, so you can make tea and (instant)coffee. Please note that you don't have access to the kitchen itself (as also clearly mentioned), but this is no issue as there are multiple supermarkets nearby in less than 5 minutes walking. Other than that, there is a: no shoes in the house policy, so it's a nice and clean house. I took off my shoes after I entered the house. When I arrived there were 2 clean folded towels placed nicely on the bed. Jean also has some notes for you on the desk with for instance the wifi password. The wifi works very well and I never had an issue with it.
Jean wasn't at the house most of the time, but his parents were. Perhaps good to know: it is a big family house where Jean and his sisters are from time to time, but often only Jean's parents are at home. This means that although you share the toilet and bathroom with the daughters of the house, you often are there alone. His parents are, just like Jean, super friendly and his dad even helped carrying my suitcase upstairs. They all speak French, English and Dutch, so that makes communication very easy. Jean himself responded super quick on my messages and would gladly give tips about Brussels. I was able to check out late (14:15) as my train was leaving late afternoon, so that was great too.
With regards to the location: it looks far away from the city, but in practice you're standing in the city center within 30 minutes. There are a lot of busses you can take and there is also a tram. It has a direct bus connection to the central and north station. So also for the people who would like to go sightseeing, this place is worth to consider as it has pretty good connections.
So I guess it is fair to say that I had a great stay and would highly recommend this place!