Wow, does that car bring back some great memories. A buddy and I toured the country in (might be) that car. I really liked the trick roll down rear window. We had a homemade sign on that window that stated "Candy's dandy, but Liquor's quicker" and it really got attention west of the mississippy.
We had a great time and the Merc didn't give us any trouble at all and had plenty of interior room for 4. I'd say You got a steal on it.