This place does exactly what it says.
The studio is cozy and comfortable and in a convenient location, especially for travellers from London or Lille because it's very close to Midi/Zuid. Although the apartment is not large, there is a kitchenette stocked with some basics (tea/coffee, cereal, crackers etc) and some pots/pans/utensils in case you want to do some cooking of your own - which you can as there are plenty of grocery stores and convenience stores nearby. 2 things in particular stand out for me. The central heating worked perfectly, which I was thankful for since the temperature dropped to -7 degrees whilst I was there. And the shower int he bathroom was excellent. By contrast, the WiFi dropped the connection once or twice, but this wasn't the end of the world.
Saint Gilles (or Sint Gillis in Dutch) is a cool little neighbourhood, just to the south of the main city centre. It's very diverse, with recent immigrants, students, hipsters, left-wingers, and young families all mixed together. It's perfectly safe, although quite hilly (something to bear in mind if you struggle with walking). There are some nice cafes and restaurants dotted around in the neighbourhood, but to see the rest of Brussels you need to head to the centre, which is about 5-10 minutes away by public transport (depending on the traffic) or about 20-30 minutes away by foot (depending on how fast you can walk).
I recommend this place for solo travellers, and would be happy to stay here again.