Just back from Marriott Grande Vista. Our three bedroom was beautifully furnished and the whole resort was very pretty. We were located in building 82 which was very convenient to the main pool/Marketplace/lobby. You could definitely see the construction occurring straight across the lagoon. You could also hear it, but I didn't find it too intrusive. It didn't start early and even during the day my nephew was able to nap with no problem, although you could hear it. We were on the first floor which was great for us with two toddlers in strollers.
Found the main pool to be a bit crowded but hopefully that will be eased when the new one opens. Incidentally, construction still seemed very much in progress and I'm surprised to hear it's supposed to be completed in June. If you want to avoid the construction I'd say you want a villa near one of the quiet pools, not near the central hub.