I would definitely book the inside and take the cruise. We’ve done up to 150 consecutive days in an inside cabin and I love them. The forced socialization of a cruise ship cause me to need to decompress often, and there is no better place to do that than in an inside cabin. We’ve booked plenty of balcony cabins, too, for our shorter cruises, and they truly feel like apartment living to me, where I hear everything the neighbors do and say.
One difference is that, when we’ve booked extended cruises, we’ve always booked a cabin in the location of our choice, but if it meant the difference between taking the cruise or not (especially the cruise you’re considering), I would take an inside cabin anywhere. In all of our cruising we’ve only had three inside cabins in truly awful locations, (two of them on Princess ships, one on HAL) so I figure our odds of being assigned something tolerable are pretty high.