Seen this one before, looks like a good buy and pretty sorted.
Ive had a few now , look for -
A well used one! They do NOT like sitting!!
Rear caliper seize and are big pain to change and not cheap!
You want to visit this site for buyer guide - Alfa 75 - Index page
The guys are great and know EVERYTHING there is to know!
Rear arches rot under bodykit. Jacking points and under the rear lights and round the rear windscreen rot.
So check if they have been done or not.
You want to know the condition of the prop donuts and the rear engine mount and rear gearbox bushes as this will affect your drive with drive line shunt and vibration.
So get under (dont use the jacking points if they at all look crusty!) and check for cracking rubber in these places.
2nd gear syncro always goes but can be driven around with slow change, factor £500+ for rebuild if you decide to go that route. The gearbox does like to warm up so give it a good run to check properly.
Electrics on mine have always been ok to be fair. Fans stop working as water drips from above and corrodes the connections so simply needs cleaning up.
Fixing a rusty/worn out one is WAY more expensive than getting one done like the one you are looking at. Judging by the listing I would be looking for bodywork as he seems to have done the standard problem spots. Make sure new arches where put in or cater for doing this.
They are AWESOME fun and will make you grin everyday you drive it!