Note that in this specific context, ‘villa’ denotes the entire architectural complex, comprising a number of elements such as the casino, different water basins and fountains, a nymphaeum, formal and functional gardens, etc. Depending on the location and purpose of the villa, some elements may be more emphasized than others, and some may not be present at all.
Read the two attached texts: on Renaissance villas and on humanistic conviviality.
Now imagine you are a very wealthy person living in 16th-century Rome. Write a one-page letter to a renowned architect, preferably also based in Rome, informing him of your desire to commission a villa. Explain where the villa should be situated and how you envision its use. Share your ideas about what the villa should look like, and what parts you deem indispensable. Will it have a casino? Water basins and fountains? Gardens? Be as specific as you can, and pay attention to historical accuracy.