Unless you are opting for a brick and mortar fire place where wood will be burnt, you need not worry about the kind of flooring to be used in the fireplace.
If you are using portable fireplaces that are fueled by electricity or gas, then you can use it anywhere you want because the floor underneath will not become very hot.
Even if it does, you can always change its location to solve the problem.
However, if you are going to install a traditional fireplace that uses wood as fuel in your house, you will have to consider the quality of flooring to be used.
Needless to say, you cannot use ceramic tiles or others such flooring options that will crack under intense heat.
There is no sense in using expensive stones like a marble as well because the place will be permanently charred with ashes, soot and dust.
The best option is to go in for simple yet elegant looking plain flooring.
There is the best option because you can always redo the floor whenever you want.
It is best to clean the fireplace and refurbish it once in a year, preferably before winter begins.
Using inexpensive cement based flooring will help you maintain a clean appearance without any problem.
You can also install the portable fireplace in the space you have provided for the traditional fireplace.
The cement flooring will function perfectly fine even when used in conjunction with gas or electric heating devices.
What is more, you can give it a try yourself.