Give BuyNothing a shot if you haven't already!

They have an app and facebook groups depending on where people are willing to use it, but instead of it being a marketplace, everything on it is free. (though you can offer to pay shipping from a local provider)

Lots of people offer up furniture, especially older/antique stuff on there all the time, as well as tons of other stuff. Also a great way to get rid of things you don't personally want anymore but don't want anyone to end up paying out of pocket for.