The term 'sty' often implies basic or rustic conditions for animals, not fancy. The old sty was made of wood and had no decorations.
Pro Tip 2/3
Pejorative Use
'Sty' can be used to insult a place by comparing it with a pigsty, suggesting messiness. Your garage looks like a sty; you should clean it!
Pro Tip 3/3
Idiomatic Expression
The phrase 'in a sty' can mean in a disorderly state, referencing the pig's living place. He lived in a sty, with piles of unwashed dishes reaching the ceiling.