I have nothing bad to say about the place itself - it's a nicely furnished apartment with a separate ensuite bedroom and a generous lounge area. It has everything I needed.
I had a very negative experience during my stay though, where in the middle of my reservation all of my possessions were moved out of the flat without any notice. It seems the hosts' reservation system for some reason mistakenly told them I would be checking out 2 days before the end of my reservation, and they decided to chuck my stuff out of the apartment and put it into their office (while I was working elsewhere in Brussels). No one cared to check with me why my stuff is still scattered around the apartment although they had my contact details through Airbnb. You can imagine my shock coming back after a full day's work to find that someone has been handling and packing my things, including clothes, laundry, toiletries, food items and documents. The additional source of frustration was that I couldn't even communicate with the lady who is managing the apartments in that building and who moved my stuff as she couldn't speak English (I've never actually spoken to Simon directly). In the end I was moved to another apartment, which in my view was of inferior quality to the first one. It's difficult to overstate the level of stress this caused and the amount of time wasted on moving my stuff and then communicating with Airbnb to resolve the issue (which they did within a few days).
For anyone booking with these guys I would strongly suggest checking that they've got your reservation right at the very beginning.