I was thinking Yeah - Yeah - Yeah - until I got to $250. Nice looking unit, desirable color (though black cooks just as well.) Look at the propane tank and connection and see if you can get that refilled. They originally came with a quick disconnect and you may have difficulty finding a dealer with equipment that can refill it. And it might be out of date and require new valve and/or certification. It looks like the PO has upgraded the 5 pound tank to a 20 pound tank. The 5 pound tank costs about $55. The 20 pound tank might last your natural life.
These are things to factor into your offering price. (The new ones come in red too, but it is a darker brick red.)
I'm looking at replacing the burner on mine and that's going to set me back at least $25. But I only paid $50 for mine. (Black and no rotisserie.)
Good luck with negotiations - she's a beaut!