When this place gets the most crowded it can get quiet chatty and loud inside the cafe. But if you stay for a while you'll notice the crowd ebbing out and only people with their laptops or reading books remain. This place is not that old but it's been popular from the start and for good reasons.
Visit this place for a super fika. This place doesn't have specialties. Starting from the coffee (or tea if you prefer) to the pastries and sandwiches, all of it tastes great. You could chose to have lunch here as well since they do serve a couple full meals.
The only time I've found this place being calm is after lunch on weekdays, try maybe 2pm.
Mon-Th: 07:00-19:00
Fr: 07:00-18:00
Sa-Su: 09:00-18:00