I love Katriina and used to visit the place almost every day when I studied for my high school's final exams at the university's library.
The place has an interesting and cozy decor, which makes you feel comfortable. The system is simple and quick, you get your food immediately after payment. Soup includes a side-saland that usually was sprouts, which is a huge plus, in my opinion! There were normally at least 3 different sorts of soups, all amazing (e.g. beetroot-coconut, lentil-curry, Mexican beans...). You could top your soup with peanuts and have the delicious, legendary fresh buns!
To finish the meal, have a coffee/tea or a cupful of some dessert they have to offer.Pros: Delicious soups, Many absolutely amazing option, Fresh, self-made bread!!
Cons: Busy during lunch hours, Only open during the lunch, Awkwardly small tables