W210 are a great car. If well taken care of with a carfax and inspection before purchase you should be good. I have the 2002 E320 and have only put basic servicing into it(Brakes, tires, fluids, whipers, rotors, filters) Its a great car. Test drive it and look out for rust, leaks and all the basic things and you should be good.

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2015 ML350 4Matic. Wifes DD
2015 GLK350 4Matic. My winter DD
2012 E350 4Matic. Road Trip car
2009 CLK350 Coupe Designo.Kleemann Tune For nice days/DD
2006 CL600. V12.Eurocharged Tune. Enough said
2005 CLK55 AMG Coupe.Kleemann Tune. For the sound and style
2004 CLK320 Cabriolet. 2005+ Interior swap. For the sunny Florida days & beach days