For the adventure
Why locals love it
It's somewhat of a place for the Kalamaja local Russian community, but other folks go there for an authentic 90s experience. This place has probably only served around ten tourists in its lifetime, even though it looks like it has been there forever. Cheap beer, cheap (but surprisingly good) food, cheap furniture and awful music.
Why you should visit it
You might have had to imagine it before, but this is what Eastern Europe actually is. Well... in Tallinn there is at least one place left like this. Kolm Lõvi definitely takes some courage to visit – hence the name "Three Lions".
Take a deep breath before you go in and just accept. It's open when it's open.