Indoors - and still alive

My record with indoor plants is not good - it used to be said I could kill artificial ones!  This Christmas Cactus arrived last December with all its flowers in the bottom of the box (I complained and got a refund) I stood it on the kitchen windowsill with not much hope of it surviving, water it every Sunday (if I remember), and dust it occasionally. Well it looks OK - perhaps it will bloom around Christmas time. If it does, I'll Blip it again (hopefully with flowers attached!)