quite safe Penny, there are no steps in the Giralda it's ramps, it gets a little cramped, but there are windows where you can stop and rest, interesting rooftop tour.

There was one day and time if you go to the mass and you don’t need a ticket. Check the website

lo desconozco

Si

Se non trovi tramite il sito relativo informazioni in merito, potresti provare a telefonare.

FOR sure yes

There are masses held at the cathedral. You can check the schedule on their website. It's free to attend mass. As for your bag, not sure if it's allowed

Purchase tickets online to avoid the long lines. Go early in the morning so it's not too hot. Do the tower first because it's somewhat tiring if you're not use to doing stairs. Then spend the rest of the time in the cathedral itself. It's fair big so plan for at least 1 hour.

In Spanien werden kurze Hosen in Kirchen nicht so gerne gesehen - also besser lange Hosen tragen