It's a nice place to have sweet (non-alcoholic!) drinks and relax with friends. The service is rather slow (ordering, receiving drinks, paying the bill), but let's be realistic - if you're here, you're enjoying your sweet time in the company of others.
You would expect to pay about $4 to $7 for a single drink (including tax and tips), and I'd say that you'd chat for 1 to 2 hours. The place can get really busy and noisy; a full house is quite common on weekend nights.
Side note: Due to the current construction/renovation, the store literally has no sign. If you have never been to this shop before, then you will need to step inside to find out its name. You cannot spot it while driving or from the sidewalk. There isn't even a temporary makeshift sign. There is no sign at all. But the shop is still operating normally, so if you know about this location, just step in and order your drink.