Ease of use is a loaded question. Its a car that was designed over 45 years ago. Treat it as such. Its 'ease of use' will be similar to other cars designed 45 years ago. Compared to modern cars, no power amenities, less power than any Hyundai or Kia made in the last 15 years and more engine, road and wind noise than any modern car.

If 'ease of use' is a top of list requirement, you probably should not be considering any vintage car.

When new, the Amazon was probably as reliable as or better than most of the cars of that vintage. The reliability of the particular Amazon you are looking at will depend on how it has been maintained / restored. On the up-side, most parts are available; but, generally from specialist suppliers and for a slightly premium price. Plan to do your own maintenance because finding mechanics who have worked on a car that does not have an OBDII port is increasingly difficult.