I gave it 5 stars to practice my Spanish (!), but where it was set is anyone's guess, there was no alluding to any city, so could have been Mexico, Argentina - certainly not Spain as you'll see when the story unfolds.
Once again, Netflix seem to love these novellas where the set design comprises a lot of concrete. The interrogation room was devoid of anything bar a table and concrete ! Modern directors also seem to loathe lighting for reasons peculiar to themselves. So the audience has to play a guessing game of what is actually happening. The same when anyone enters their own home - WHY isn't the first thing they do is switch on a light ???? No they all stumble around in the dark instead. We need realism in our movies not the fantasy of the director.
The storyline itself was good, but it was the depiction of the production team that ruined it. I didn't mind seeing unknown actors playing the characters, but being English there are few well known Spanish actors to me anyway.
I won't spoil the ending, but its not something I want to sit through again, and it will be interesting to see if there will be a Diary of a Gigolo Pt 2.