Just really quick:
Engine comes out for timing belts, which is part of a major service. Done every 3 to 5 years depending on your thoughts on rubber degradation. Dropping the engine out of these things though is not that big a deal. Biggest problem is that parts are generally a bit scarce, and are frighteningly expensive if you can find some of them. Luckily there is some crossover to FIATs and as such, you can find the same part, not in a yellow box, for much less.
Biggest problem is people not driving these cars regularly. That likely causes more problems than the shoddy italian engineering