Isn't it ironic: in A Room of One's Own, Woolf tells us a woman needs a room of her own, with a lock on the door, in order to have the freedom to write (6.10). That is, she needs the freedom to confine herself in a room in order to have the mental freedom she needs to create art. Confusing, right? Woolf plays with what those ideas might mean: she goes over the difference between being locked out and locked in and explains that physical freedom influences mental freedom. All of this in order to perform what sounds like a freaky occult ritual: to allow dead Judith Shakespeare to inhabit a new body.
For Woolf, the problem with contemporary men's writing isn't that they don't have the freedom they need to write, it's that they need another group (women) to be unfree.
The "common sitting room" is a confined space, even though it's probably bigger and nicer than any little room a woman might have to herself. This is because writing in the "common sitting room" confines women to writing only certain kinds of texts.