We enjoyed our stay!
The location of the accommodation, in a quiet street between Parc Cinquantenaire and Parc Leopold and very close to Place Jourdan and its many restaurants, is definitely a big plus. The double room (bed, bathroom, room) was clean and well maintained, all facilities worked perfectly. The room is indeed cozy, although actually quite small. It's not really designed for guests to be in the room outside of sleeping hours.
The room is located on the ground floor next to the main entrance of the building and the only window (window ledge at knee height) opens to the street. Therefore, opening the window, even if it is just tilted, is not really an option, because of the potential noise from outside. Therefore and especially for summer months a fan or ac would be a necessary additional amnety. Without one of them the room would get quite warm and stuffy, particularly during summer. Apart from that, all was good and went smoothly.