Corp Pilot -
Stayed at Anse Chastanet in early December, and spent two nights visiting new friends up in Jade Mountain. If you go there, there is no doubt will will get that feeling of leaving the world behind.
If you book at Jade Mountain, you will have no problem being 'romantic' despite an open wall! The open wall accommodates the patio that faces the Pitons and the infinity pool, so you can soak in the magnificent views. The bed is tucked further inside, and you will likely not hear anyone, nor them you. In fact, you may feel completely secluded there, and may never want to leave. Anse Chastanet and Jade Mountain accommodate many honeymooners and couples, so romance and relaxation is in the air.
Construction at Jade Mountain is progressing, and when I was there, the new deadline was March. Noise was minimal, and construction in St. Lucia is nothing like in the states.
Can't comment on the bugs in March/April, but they were pretty much invisible while we were there in December. I saw a few mosquitoes, but no other bugs, and we did not get any bites. Bring bug spray with you just in case.
Go with the stairmaster if you want to buff up for bikini weather for your wife, but the stairs are really not a problem. The stairs from Jade Mountain and the hillside cottages at Anse Chastanet are very low rise, as the sides of the stairs are paved so it can double as a road for the shuttle. The stairs from The Treehouse restaurant to the beach are broken up with several rest and viewing areas. We are fit people in our 30s and work out regularly, but there were couples there easily in their 60s managing the stairs just fine.
It's a beautiful, relaxing resort and I don't doubt you will have the experience of a lifetime if you go!