Go straight to the top floor. Frescoes and mosaics are amazing.
The best baroque church in Rome. Amazing ceiling paintings: for optical illusion, stand at the center and look up
They have an excellent collection including work by Caravaggio & his coterie of imitators but the real knockout is the giant fresco by Pietro da Cortona. Stupendous.
Audrey Hepburn stayed here while shooting Roman Holiday so the least you can do is get a drink at the bar. They make a good negroni and sometimes there is a pianist.
Every night at 1900 they pop a bottle of great champagne with a sword and then pass around glasses for all guests seated in the cafe/bar. Lots of fun!
