Things to check:-
Creaking clutch pedal. Probably just the pivot but a bugger to get at.
Sticking clutch pedal - it doesn't always return the last 20 - 30mm of travel. Can be pivot bearing, master or slave cylinder or even clutch. if it is slave cylinder or clutch then that very expensive.
It should pull faultlessly smooth - test it by cruising on light throttle and then both very, very gently accelerating and hard accelerating - any hesitation suggests possible glogged EGR valve or clogged DPF. EGR can be removed and cleaned or replaced (£150 incl labour) relatively cheaply but clogged DPF while rare is VERY expensive. Either fault should show a Engine Management Light and hold fault code in the ECU but that doesn't always happen. Either way have it remapped and both of these constipation devices removed - you will not look back.
Check all the tyres front and rear for edge wear. If there is any then negotiate a reduction for tyres and a 4 wheel alignment (£100) adjustment. If they are new tyres negotiate a 4 wheel alignment anyway - read the thread by "OldEngineer" (link below) on tyre wear and you will know it must be done with settings different to the manufacturers.
Play a CD and make sure it ejects. The players are known for not playing and not ejecting CDs. That usually means removing the player to get them out. Not hard but frustrating.
If Bluetooth phone connection is essential make sure the Blue&Me connects to your phone.
Take a memory stick with MP3s on it and check that it plays through the USB port in the glove box and that the steering controls work.
When playing music also make sure the voice controls work. When playing the music press the "voice" button on the steering, it looks like this ))) and say aloud "next." The player should move to the next track. Try the same with a CD playing and again it should go to the next track.
Voice and steering controls should also work with your phone.
If you hear "Language pack not installed" again it is a free download onto a memory stick and you can install it yourself. My car was 3 years old and the English language was not loaded onto the car from new!
With the exception of sticking CDs most of the media player issues can be fixed with a simple software upgrade that you can download for free and do yourself from a USB stick but some cars systems play sill buggers and won't accept the update.
Do all the usual checks and remember that the cam belt is both mileage and / or time dependent.
The brembo brake callipers have do seize but a relatively simple strip and clean will get them working again but the pad retaining pins will probably be destroyed getting them out. The pins are a few pounds each and 1hrs labour should be enough to unseize the callipers.
Make sure there is no vibration under light or heavy braking. Seized or previously seized callipers have been known to warp disks. £300 should get good pads and discs and 1hr to fit.
The boot hydraulic rams have plastic ends and these break so look closely at yours for cracks - you only know they are failed when the second one breaks and the boot hits the rear window. I my replacement ones were about £40 per pair with metal ends and a very easy fit for DIY.
Make sure it has two keys and that both open the car and start it. It can be just a battery or £300 fix if one doesn't work.
You decide how hard to haggle if there are any faults described above. Unless it is an Alfa specialist they won't know themselves if the fixes are cheap or expensive.
I have listed most of the common faults. As this one has nice mileage it will have been driven regularly and hopefully well maintained and these car like that. Low mileage cars that spend long periods of time standing and are only serviced by mileage usually give more problems so you should avoid a lot of the above.