Yay, you are the lucky owner of a rare Philodendron Birkin. Here's few tips to look after your plant.
With its stunning foliage this Philodendron has very quickly become a very popular houseplant. The Birkin, carrying the same name as the very expensive celebrity adored bags, it is part of the large genus of flowering plants in the Araceae family, within the Philodendron genus.
Similar to other Philodendron plants, the Birkin prefers medium to bright indirect light. If you could place this rare plant in a bright east or west window indoors it would be really happy. Mine is in a spot that gets a bit of sun in the summers for an hour or so and seems to be really enjoying it.
Also, the brighter the light and lower the temperature (19-20 degrees Celsius) the whiter the variegation is.
Philodendron plants are native to rainforests so they prefer a humid environment and moist soil (not wet).
Same as the vast majority of the plants: stick your finger in the soil; it it comes out with soil it's still moist and doesn't need watering. Also, be careful what soil mix you use for tropical plants. Choose a mix that drains fast. Tip: Try a potting mix rich in bark/peat.
It really depends on what fertiliser you are using and the environment plants are growing into. Most plants require feed every two weeks during growing season. Check out this article for fertiliser recommendations and tips.
I use a moisture meter with all my plants. I know some people don't trust them or like them but I have found one that I trust and for my Philodendron Birkin I keep the moisture level around 4.