The prestige number (shown on the up-left corner) is a number from 1-5. Every decorative object gives you 0.00x of prestige, every guest the same. For example, a hotel certificate gives you 0.02 of prestige, what means that with 50 hotel certificates you will have 2 of prestige (or "stars").
That means that you don't need, for now, any minimum things (days played, guests...), you'll get prestige by the both ways (if, let's say, 100 happy guests, it would increase on 1 the prestige level, or 50 guests and 25 hotel certifcates).
But you can loose prestige too (guests leaving before they should and selling the decoratives objects).
That's how the prestige system works. Hope you have understood everything, if not, let us know!
- Avr Games