My 2c?
If that's truly where it's been living as a 1 owner car, it should be pretty solid/rust free. On which basis, anything you pay is likely to be fair as fixing rust - seen and otherwise - is pricey
If, however, the car is a 4 owner car and prior to your aunt buying it it was a daily driver on salty wet roads.... go carefully!
There's a buyers guide you now have access to, and MotoringInvestments on Youtube did a video buyers guide that's also very good.
Short of an actual on ramp inspection/full documents:
Asssume the engine has been through 114k (since July 1970), and think that at some point it will need a rebuild but if it's been regularly serviced (when in use), that could be some time away. So if there's a decent history file... Arguably better for use than sitting doing <300m a year
Check for rust - closely around the headlamp bowls, trunk floor, lips of the wheel arches and up inside the front wheel well - there's a longitudunal structural "shelf" above and inboard of the front wheels. Put your hand up there, or phone and see what you find.
BUT, if it's been sitting for a while, it'll need a full recomissioning (use our search function) from fuel system to radiator, tyres upwards
If you love the look of the car, it really will never make sense. There's no such thing as a cheap one, and it will end up costing you time/money or both. Sense is buying a Toyota. But life is short and you'll get many more smiles per mile. Stop Making Sense