Thanks guys, I appreciate the input! I got the feeling it was a good price, but it's hard to compare because there aren't a lot of 10k-mile examples floating around at there to use as yardsticks. I don't know the whole story, but I get the feeling the person selling the car is more interested in seeing it go to a buyer they like than making a lot of money off it.
Really, really hoping it turns out to be as good as it sounds and my dad can get it. I'd love to go look at it myself, but I have to be at work too early that day to make the drive up and back.

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1987 300D, arctic white/palomino--314,000 miles
1978 240D 4-speed, Euro Delivery, light ivory/bamboo--370,000 miles
2005 Jeep Liberty CRD Limited, light khaki/slate--140,000 miles
2018 Chevy Cruze diesel, 6-speed manual, satin steel metallic/kalahari--19,000 miles
1982 Peugeot 505 diesel, 4-speed manual, blue/blue, 130,000 miles
1995 S320, black/parchment--34,000 miles (Dad's car)