The good
Stéphanie and her boyfriend have both been very good with communicating whenever I would message them and would always reply with detailed responses which made the (flexible) checking in and checking out process very easy. The flat is practically two minutes walk from the Delacroix metro station and the Gare de l'Ouest/Weststation is less than ten minutes walk away. The four lines at those stations should take you anywhere in Brussels. There are grocery stores and supermarkets close to that station if you want to stock up on food.
The bad
The flat wasn't as clean as I expected it to be. As other guests have commented, the upholstery in the living room has stains on it which makes it rather uninviting and the walls could definitely use a fresh coat of paint. Especially the wall behind the beds which is rather dirty.
The kitchen tap and sink along with with the showerhead and the tap in the bathroom were covered in limescale and the mirror in the bathroom was so streaky, I had to give it a good wipe before attempting to use it.
The water and heating temperature are turned all the way down so unless you know how to adjust those on the boiler, you will be having cold showers in a cold flat. I didn't find a guide available on how to operate the boiler or any of the devices in the flat (washing machine & dishwasher). The boiler is also leaking from time to time and it's leaking on a towel sitting on top of the microwave oven, close to an extension lead.
The neighbourhood may not look as posh as other places in Brussels but I had no problems there whatsoever and definitely didn't feel unsafe. However, it is a rather dirty neighbourhood with lots of rubbish on the pavements. I understand that the host of this flat can't do anything about that, but I believe it's worth a mention. Likewise for the noisy neighbours next door who are very loud either when they are on the phone or when talking amongst themselves. And this noise can on go till rather late at night.