Looks like a nice car. However, you said you're looking specificaly for a 116, right? 'cause that's a 123 300D.
I would call the Buy-It-Now price a bit steep, given that the driver's window and the sunroof don't work, but that's just me.
FWIW, from what I've heard, the biggest real problem wiht the 116's is rust...aparently, M-B didn'tdo as good a job of rustproofing on the 116 chassis as they did on others...
Hope that helps a bit...good luck!