Great place overall! It's the perfect size for a 1 or 2 guests even though there's probably room for a 3rd person. The owner has done a great job at fully maximizing the available space to make the apartment feel much bigger than it is.
It's located in a nice working class neighborhood just outside the touristy area, with a lot of amenities nearby (grocery, fast food, general purpose store, etc). It's also located a mere 2 minute walk from Annessens metro stop, and only a 10-15 min walk to the center of town.
Do be aware that it can be a bit cumbersome to reach the loft bed at the top of the ladder, and I would not book this if you have any sort of mobility issues.