An unbeatable location if you need to work in the European Quarter and want to be close the city center and top spots for sightseeing, all within walking distance.
The duplex has everything you need for a really comfortable stay, and, as advertised, it does have lovely large windows and fantastic views from the living room on the top floor.
The only downside was that it doesn't have air conditioning, and the top floor gets quite hot. A fan was provided in the bedroom, so there's no problem sleeping. It doesn't tend to get that hot in Brussels (depends a bit on what you're used to) but something to keep in mind if you're there in the middle of summer.
I would definitely stay there again and highly recommend it.