Book Casa Batlló General Visit if you and Atalya decide to do one extra paid Gaudí-house interior. Current Saturday dashboard places the Passeig de Gràcia / architecture block at 11:00–13:00; Casa Batlló is one option there, alongside La Pedrera or exterior-only. If booking Casa Batlló, working target is around 11:30 Saturday so the roughly 1h15 visit fits that block. Official tickets: https://www.casabatllo.es/en/online-tickets/