@pop_smoke a typical solution would be to store the .csvs in a Volume within your Unity Catalog in the Free Edition

Here's an example:

Syntax used for writing
One Example:

df.write.format("csv").mode("overwrite").save("/Volumes/workspace/default/volume_files/media_customer_reviews")

Another Example:

df.write.csv("/Volumes/workspace/default/volume_files/media_customer_reviews", header=True, mode="overwrite")

Official docs for syntax: https://spark.apache.org/docs/latest/api/python/reference/pyspark.sql/api/pyspark.sql.DataFrameWrite... 

All the best,
BS