The only thing I would say is that bearing in mind this camera dates back to the early 1980's, you'd almost certainly need to replace the light seals if they haven't already been done. I don't know of any specific problems relating to the AV-1, but the fact that it is auto-only (aperture priority) would put me off buying it, although it's fine as an additional body if you have manual equivalents.

As this model will be dependent on battery power, I'd check on how easily available the batteries are to get hold of.