Planning a trip to Italy next year - don't know the exact length (probably a week to 10 days), and was thinking of Venice, then Florence, perhaps Bologna, then Rome. And maybe Naples.

All inter-Italy travel will be on train, so time spent in each city is flexible and I can decide that later, the only thing I need to figure out is start and end points because I want to book the award seats as soon as I find availability for the time I want.

The logical ordering is Venice-Bologna-Florence-Rome-Naples, or vice versa - award availability will determine that order. Venice is a must-see, so I know that's at one end. However, I'd like to get some opinions if Rome or Naples should be on the other end - is Naples something really worth seeing, or is time better spent in VCE, FCO, or any of the cities in between?

Also, what sort of weather could I expect in mid-April, I'm eyeing sometime around then, hopefully before Italy gets too overrun with tourists in the summer months. Thanks in advance