Free is good !!
... The worst you will have is some time and transportation invested in the stove.. I'd go get it,, clean it thoroughly.. look for cracks,, missing parts.. Make sure the grate and mechanism moves freely so you can shake the ashes down into the ashpan.
Then try using it as a wood stove,, see if you have any problems.. then you can add coal to a hot wood fire, and try it with coall.. With the 'price' you are able to get virtually free hands-on experience... and at the very least it is worth something as scrap steel..
You never know,, it may be perfect for you and your install,, give it a try..