Why locals love it
Alcatraz is a small, but really popular bar. The number of its visitors often exceeds the size of the place. It's a crowded hangout in the evening and a spot to get inexpensive coffee during the day. All sorts of rock memorabilia and accompanying music are bringing a lot of people in, especially on weekends.
Why you should visit it
The bar is perfectly positioned, it's only 5 minutes away from the Zagreb central square, yet the prices are moderate, even lower than average prices in the city center. It's open till 2 AM each day.
Even when it seems that the place is so crowded that it's hopeless, there's a chance to find a table upstairs.