The best way is always well wrapped (as in the original chocolate bar package) and in a cool area. Not all chocolates are the same, Some are processed to raise their melting point (by changing ingredients or tempering) and may remain stable at room temperatures or warmer.
depends if you store the chocolate in a cupboard or a fridge
To make chocolate softer, refrain from putting chocolate in your fridge or freezer. Store it in room temperature but dont heat it up or else it will melt.
polystrene
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To prevent organic chocolate from melting and losing its shape and texture, store it in a cool, dry place away from direct sunlight. You can also temper the chocolate before using it in recipes to help maintain its structure. Additionally, avoid exposing the chocolate to sudden temperature changes and handle it gently to prevent melting.
The higher the temperature the faster the chocolate will melt.
Ideally, yes you do. If you're not okay with storing butter at room temperature, then you wouldn't be okay with storing the cake at room temperature either.
The best way to store chocolate is in a cool, dry place away from sunlight and strong odors. It should be kept in an airtight container to prevent moisture and odors from affecting its taste. Avoid storing it in the refrigerator as it can cause the chocolate to develop a white film called "bloom."
Chocolate begins to soften and melt at around 90-94°F (32-34°C). It is important to store chocolate in a cool, dry place to prevent it from melting too quickly.
110 Fahrenheit is a better estimate.
It keeps well in the fridge, since it melts easily. If not the fridge, then at least a cool, dark place. In addition, chocolate tastes great after being stored in the freezer - especially dark chocolate!
In a dry room temperature space.