I have a '91 190e 2.6 with almost 134K. I bought it in January with 128.5 K on it for $6500. I considered this a good price at the time. It sounds like you are getting a good deal. I do a pretty long commute (60 miles round trip per day). So far the car has been great and I've really enjoyed it. No major problems. I haven't had to do any major repairs, but I had a few minor things done (Flex disk, tie rods) and the repair costs were less than I expected. This is my first MB, but I will certainly buy another one. If the car is in good shape and you have it checked out with an MB mechanic, I'd go for it.
Happy 190e owner