This is a beautiful apartment. It has every facility you would need to make your stay comfortable. All the utensils and appliances are very high standard. The furniture and lighting is excellent and there is a lovely light due to the colour scheme. There is a very interesting book collection and an electronic piano/organ for the musical.
The bedroom is very comfortable. The bathroom has a large bath/shower and is very spacious. Public transport connections are excellent. Place Flagey is a 1-2 minute walk with several tram and bus connections. Avenue Louise is 7 minutes with metro, bus and tram from there onwards. Once you have the transport card this is an excellent spot to explore Brussels and surrounding area from.
One thing to note would be this apartment doesn't suite older or people with a balance issue. The bed is raised, which gives ample storage but for those with a disability of some kind it has steep steps down.
We had no trouble sleeping but friday nights in Flagey is busy for socialising so you might bring a noise reducer / ear buds if you're a light sleeper.