Look, I've read the whole thread and have still yet to establish what people should call the room with toys in (in which children play) if playroom isn't acceptable? I mean the room with your sofa/settee in it can be called a lounge, a living room or a sitting room. What else would you call a playroom?
I don't have a playroom, but if I did, that's what I'd call it.
Oh, and to the people that think 'stealth' boasting is going on on this thread - look up the word 'stealth' and some threads supposedly about the OPs PFB and whether reading War and Peace is normal at 5yo. Stealth boasting is not discussing pantries, studies and orangeries!!