There is a book titled Churches in Rome but there are probably a lot of smaller churches not listed. There is a small church not far from the above Basilica which is nice to see and open 9 - 11.

From the Vatican website: Sundays and Feasts: 9:00 am – Liturgy of the Hours 10:00 am – Holy Mass of the Canons (in Latin) 4:40 pm – Holy Rosary 5:15 pm – Vespers

The entrance to the church itself is free. No need for reservations. There may be a wait to get past the security guards. There is a museum there and some galleries that charge a few euros to get in.

Am sorry I have no idea ! Contact the Basilica directly !

Sí está permitido hacer fotos.

I am afraid I do knit know. We were tourists in October and not Rome resident

no idea, sorry.

We were there over a hour it was very beautiful depending on your interest

大丈夫です

I didn’t get to visit The Borghese galley because it was too far away from everything. The Santa Maria is about a 10-15 walk from the colosseum . I used my navigation on my phone to help me get the most out of my time and miles. You can also walk to the Trevi Fountain from the Colosseum. Safe travels..