The plant appreciates cool conditions, and a very acidic mix kept always moist, almost like a CP. Deadhead any flowers after they fade, and prune back the branch after it flowers. It is a light lover as well, and needs some sun. They are best regarded as outdoor plants, I have never had success with in house cultivation long term.
It's funny Buster, some people react that way towards the scent of Gardenia. Usually the same folk don't much care for the smell of Narcissus or Tuberoses. I think it's similar to folk who don't like the taste of Broccoli or Brusselsprouts. They did a study and found those that didn't like the taste had a higher number of taste buds on their tongue. Probably you have a very acute sense of smell. I rather like the scent of Gardenias, but then I don't have a tree of them outside my window! I used to have a mock orange that flowered and was also overpowering, almost revolting after awhile. Another strong sweet scented flower is Asparagus Fern, and THAT one I don't like at all. Gak.