Such a nice atmospheric restaurant. Foods also delicious especially if you like Slavic meals. As far as I noticed people go here for having coffee and dessert. Prices are reasonable I recommend try traditional Estonian desserts.
A good place to meet the people of Tallinn. It is a big cafeteria. With a pay per weight buffet kind of thing. I do not think the food itself deserves more than tree stars. However it's cheap and better than what you get at most cafeterias.
However I still think it deserves 4 stars, mainly because the place gives you an rare opportunity to observe the common Tallinn cityzen. The staff was also very helpful.
If you go here, try the dumplings, with sour creme and dill (dill can be found at the soup table). I also had the pancake with cottage cheese, which were good as well. Or you can do as most of the locals at start with one of the soups.