Overall, decent value.
The apartment is really convenient to the Charleroi Airport Shuttle (<5 minutes), as well as public transport. The area itself is okay and within a 15 minute walk of the touristy places. It has a nice view over the neighbouring rooftops and a skyscraper!
There was only one (huge, 240x220cm) blanket, so make sure to ask for another one if you're not used to sharing. In the winter, we found the apartment a bit cold and couldn't work out the thermostat, but that should probably be an easy fix.