Looking at the mileage in the last five years (2k, so less than 500 a year) you need to pay a lot of attention to rubbers, bearings, brakes, anything with a seal and rotating part, and gaskets. Parts will have been sat for a long time without movement and this can cause issues; take it for a long test drive and look for leaks.
As previously make sure you get an inspection even if they say it's been inspected, use someone else and be there with it when inspected. If they won't allow an independent inspection walk away.
I've had a number of issues with mine since purchase (drop links, shock failed, oil leaks, coolant hose split, coolant leak, knock sensors, discs, pads and now caliper plate lift causing pads not to fit!) and it appears to have been the same circumstance(few miles per year); a lot to be said for regular use. If you are a dab hand with a spanner you can reduce running costs considerably (and really it's not that scary). Just be prepared for some bills, as well as regular maintenance costs. Go in with your eyes wide open is the best advise e.g. Realise that parts are 3-4 times as expensive as a regular car, most parts are only available from Maserati.
Any questions just ask, the only stupid question is the one you didn't ask!