I only tried their drinks once, so I can't tell much about it. The selection is pretty good, and the caramel latte I tried was very aromatic.
What differentiate Hestia is the service and the friendliness. It is rare these days to find companies that will be so focused on welcoming their clients in a warm matter. They take the effort to explain to you right off the bat, instead of you asking for information. Even saying "have a nice day" at the end does a lot of difference.
Also, they handle promotions like experts. While waiting for my drink, they gently talk about their buy 10 get 1 free drink deal and their free drink on your birthday.
Also, it's a cozy place where you can sit down and study or have a talk with friends. It comes with free wi-fi too :)