if you buy it, expect to put some money into it. that is inevitable with any car of that age. You can expect one or more window motors/regulators to fail if they haven't already. The ball joints and suspension bushings are probably worn too. The belt tensioner is another wear item. Things like this can add up to $1k or more real quick. Like someone said, if the ac isn't working, and you can't rule out the evaporator being the problem (i believe the driers fail pretty regularly on these cars like they did on mine and they are not that expensive to fix), don't buy it unless you don't care about ac.

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2005 Mercedes C230k sport sedan, 6 speed
1987 Porsche 924S - 968-engined track car