Stayed in this apartment for one whole month. Everything was perfect. I would totally recommend to stay here for short or longer stays (like mine). You have everything you need, it was fully equipped and the host is very helpful and reachable. Check in and check out were easy too.
The apartment is in a new building in one of the main streets of Brussels, but not exactly in the city center (if you'd like to avoid all the touristic area it is great!). However, communication is good: there are 2 tram lines just below and 2 busses (38 and 60). You can get to the center or EU area pretty fast.
About the surroundings: it is close to several parks if you like to do outdoor activities. It is also close to Flagey where you'll find a very nice market each saturday morning. In the area there are several good restaurants and gyms too. The location couldn't be better.
The things I valued the most: the view from the terrace (absolutely amazing), very comfortable bed and the grocery shop just below (very convenient)
I would have stayed longer without any doubt but it was already fully booked.