I've bought a few cars from eBay, and what I like to see (as mentioned above) is a full and proper description with good English and grammar, and
not in the Comic Sans font with lots of crazy colours! You see so many ads on eBay saying "superb", "best example in the UK" etc. which then go on to list numerous rusty bits and faults.

I avoid ads with these kind of statements like the plague as I find them dishonest, unless it really is a potential concourse winner of course.
I like the ad broken down into good points and bad points, with the bad points described honestly. For most Alfa models an enthusiast buyer is going to want to know when the cam belt was last done and by whom. A photo of the invoice for this work would be good. If it's got loads of history, take a picture of all the bills (and original owner's handbook etc.). There are plenty of traders out there who say their cars are FSH yet the bills are nowhere to be seen.
I've bought cars from eBay without looking them over first, always from honest sellers who described them accurately and honestly, and have not gone wrong yet, even with a Fiat X1/9!!