I met a lady that had a vine similar to a variegated pothos or a philodendron, with very fat and succulent heart-shaped leaves, about 4-5 millimetres thickness, 4"/10cm long, hanging on water-filled stems about 4mm across. It was a very succulent dark green shade loving vine. The lady told me that she had it for ages and it was an easy plant.
Can you think of a plant that is like a hybrid of these two varieties? The nearest I have found is Scindapsus/Photos except with very fat leaves.