Actually, that is not an '88, but rather an '89 with S4 wheels. You can tell by the newer '89 up mirrors (although '88 Commemoratives come with those) and Renault shifter with collar. I also remember it being an '89 back when a friend owned it.
Almost certain that is the old Sigurd Enoksen car from back in the day. He ordered an original V8/S4s rear spoiler (Hi Atwell!) back in the late 90s around '98 or so and this exact wing was the one which molds were taken off to make reproduction wings for some of us clubmembers including myself.
You can tell by the picture that it wears its original '88 to '89 non-SE side skirts. Don't know how it is or who has it now, but back in the day, it was a very well-maintained and cared for car. Personally, just going off the ad, I like that car. Seems like a lot of bang for the buck and I always liked the look of the non-SE side skirts painted body color combined with the newer wing. Looks even sleeker that way and looks like a much newer car with those S4 wheels. If I had the cash, I'd be seriously considering taking a flight out there to look at it. Sadly, I don't.
One concern that I did I have when I first saw the ad a while ago was no mention of odometer mileage. People almost always put the mileage in an ad, unless it is a high mile car or it could be that they merely forgot to check before they went to work where they placed the ad.
Naturally, you will want to inquire about the timing belt and maintenance (which depending on price may not be that big a deal), but mileage would be the first thing to ask.
Roy