Time Out says
Zagreb’s prime literary club also doubles as a café. There is a symbolic membership fee of 10kn/year, but members can then enjoy WiFi, carefully chosen music, a laid-back atmosphere and regular events that include readings by the big beasts of the local literary scene – with occasional ones by visiting English speakers. One Thursday in a month is reserved for unplugged concerts by local musicians. There’s also a small library of English-language books. Good coffee and several varieties of leaf tea help to make Booksa well worth the quick tram ride or ten-minute walk from the centre.