To garner more info than you could ever need on the amazing aroid family, take a stop by the National Aroid Society's website and check out the latest in plants with huge leaves. (link below)
Water only once the pot is light (meaning all soil has completely dried out). Over watering will kill these plants much faster than under watering. This could mean once a week if kept outdoors in the sun or once every 2 weeks in an east facing window with little sun.
For the best leaf coloring keep outdoors, but out of the blazing afternoon sun. A south, East, or west facing window indoors is fine. A sign of too much light is browning leaves. A sign of too little light is elongated growth. Remember, even the toughest succulents need to be acclimated to a new environment and new light intensities. Our E. Francoissi's are more tender succulents and appreciate a sunny window more than a blazing hot front porch.
Not really necessary. In the wild these plants have such poor soil they have evolved to live in nutrient deficient substrates. Over fertilizing can promote fungal and mold growth. 1 dose of succulent fertilizer at the start of the growing season should suffice.
The key word is DRAINAGE. The substrate should be high in pumice or perlite or pebbles (40-50%) to aid in drainage after watering. Potting soil that retains moisture and has high nutrient content will promote fungal and mold growth, which will kill your plant.
These plants are awesome because they can stay in relatively small pots. Like most succulents who live in poor soils their roots are ok with being fairly root-bound.