I stayed in this cozy apartment for 2 nights with my boyfriend and I think it is suitable for a young couple.
I really liked the fact that I was able to take and leave the keys in a locker. That made the check in and out easier. Personally, I would have preferred to stay in a more centrally located place as it is not so easy to walk every time from the apartment to the city center. The apartment has manyyyyy amenities like a fully equipped kitchen and a good hairdryer. However, I would expect to have hair shampoo, extra toilet paper, and hand soap. There was a little problem with the water pressure in the shower, as it was coming out a small amount of water and not always warm making it difficult to take a shower. However, I informed Alexia about this issue when I was leaving and I am sure she will take care of it as she seemed pretty cool.
Overall, a very good choice if you want to spend some days in Brussels.