Here is the "expert"

Sorry, I wasn't around due to health issues for weeks.
So, for planifolia (and usually all vanillas with leaves):
- keep it higher than 16°C, but it will thrive only between 20 and 35°C. In plantations, they can stand down to 13°C but don't try this at home.
- it needs light, in Europe we can leave them next to windows ans up the glasshouses.
- If active, feed them. They don't have sleep periods, just conditions inadequate for growing.
- a normal rate of growth at home is from 20 cm to 1 m per month. If less, you don't grow them the right way. (note, this is for adult plants, not cutings)
- wet roots and cold are a sure way to kill a vanilla. If you see rot coming, cut at least up or down the first clean knot, keep it dry.
- Use a pot with water reserve, the vanilla will thank you when it's hot, and no it doesn't live and grow like "normal orchids".
- For the mix, the classic mix is about half humus, complete with bark mostly and elements to keep air circulating (change every 2 years or less if totaly degraded). I use a mix of coco chips mostly, with bark and stuff to keep air flowing (still thriving in it after 3 years and a half).
In case, I've been already explaining things in other threads, a search on vanilla will get you there and look in the social group, there may be information there too.