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I converted my 190E to R134A about a year ago. The evaporator unit on the W201 is easy to replace as you can access it from a sub panel in the engine bay and via the top panel area under the wiper arm. Too bad the W124 designers did not follow this plan, as it only takes a couple of hours to R&R the evaporator.
Anyway, with the evaporator replaced, AC filter and condenser, I converted to R134A with ester oil. AC blows at about 48 degrees (with recirc on) with no issues at all. Because of the higher pressure of the R134A, I charged the system to about 80% of the max.
In my car, the R134A is blowing just as cold as the R12 did.
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