I own a 5' 10" Schimmel, 1985, bought it four years ago for 10K at the height of the recession.
I love the piano, love the tone, the Renner action, and the bright singing high end. I think the 13k is pretty reasonable, and if you can get it for 12, better yet.
You don't always need or want a Steinway (I've owned and played many). I also own a Yam C-7, for what that's worth.
Everything awesom_o said is correct. If in doubt, get a certified piano tech to look it over, check the sound board, the pin block, etc. But it's a pretty new ax and sounds bitchin' to me.