Well firstly consider that the bids will no doubt go up from there cos that is a very good price. I'd definantly go have a look at it in person before considering any bid. I have an 04 2.0 147 Lusso and it's been a dream so far but...
Check the wheels for welts which cause vibration when driving, the alloys have given me a nightmare.
Spare key - if it doesn't have one it's another 50 quid.
Make sure the device which makes the seats fold back is in good order, mine snapped within days and cost a huge amount to strip it down and replace.
It's a great car, really torquey (if thats a word) beware it's hard to control at times if you really go off the line, but my best advice is take a mechanic with you, cos the wishbone and other bits can be knakcered. Bare in mind as well I pay 4.9k for a 43000 miles 04 Alfa (with leather seats, supersport alloys and sat nav in built) but good luck!