Something I felt was missing from the ending.
CESAR should've also "asked" for NURIA to be at the rooftop, and then apologize to everyone. She wasn't innocent, but neither was he. He was clearly the kind of guy who's rude to one-night stands who "don't get the rules". And he did a bunch of other less serious but still wrong things to the other three.
This wouldn't have made everything O.K. but we the audience were already asked to feel sympathetic towards him from the beginning. So why not give him at least a chance at redemption?