I spent almost two weeks at Charles place in late May. It was great. It is located close to two subway stations and a trains station, allowing for easy access to large parts of Brussels. The apartment is private and offers a private bathroom, fridge and a stove with an oven. There also are some base utilities for making simple dinners (there are two supermarkets very close). As my own trip was for work and I was travelling alone, I slightly missed a microwave and a simple way of making coffe (an electric water boiler or a coffe maker) in the apartment, but there are several restaurants and places to get coffee close by.
Charles communicated well and answered all my questions in a timely manner. All in all I am very happy.