Who else sells corner sofas apart from IKEA and Maison du Monde?

Several on or just off the N2 on the way to Leuven
The big one in Alsemberg
Very good one on a side street just off Ave Louise

names escape me. www.truvo.be will do a better job

www.troc.be

I was very wary after being recommended to buy on-line but quality, service and delivery etc was excellent:

Only in French:
http://www.vente-unique.com/

even with delivery costs, good prices

https://flash-ventes.net/