I've never found an exact match for this one in my cactus books. So, from my personal experience...
Rhipsalis is very easy to grow. It likes lots of water but can do without for an amazingly long time.
It likes a rich soil, but will grow (slowly) in very poor soil.
It can put out climber roots to keep itself upright, but it isn't very good at it and will fall all over the place if you don't give it a hand.
Most of the leaves grow as big flat paddles, but it will put out triangular stems that hold themselves upright.
It grows just fine in full shade, but will thrive in full sun if the soil is good and it gets regular water.
Cuttings are very easy to grow; I've left cuttings out for months on my shelf. While they'll get shriveled and ugly, they'll grow fine when eventually planted.
The flower display can be dramatic. Snow white flowers up to five inches across start to appear on mature plants in the late spring and continue sporadically until late fall or early winter. They open at night and droop away as soon as the sun hits them, or about mid-morning if they are in full shade.