The Guilty is the most effective example of single location storytelling I've seen in quite a while.

The script is incredibly tight and the one location conceit definitely didn't overstay it's welcome, which can often happen in movies like this.

I thought the major heartbreaking revelation really was a revelation, I wouldn't even call it a "twist", because it felt so natural in hindsight. It immediately recontextualises everyone's actions and they make perfect sense. For whatever reason I felt so uneasy when Asger told Mathilde to wait with Oliver but I still wasn't expecting what ended up being revealed.

Because of how natural that heartbreaking reveal is and because of how emotionally brutal it is and because of how Asger suddenly feels partly responsible because he acted so rashly on incorrect assumptions, it also feels very natural that we learn about why he has been relegated to desk duty.

The whole "cop who did a bad thing and now needs to deal with the emotional trauma of that thing" is dealt with in such a trite manner in many movies, but because of the parallels with Iden's situation (ie doing something you felt was right in the moment even though you ultimately know it was wrong) it actually felt completely believable that he would face it/admit it/etc. the way he ends up doing when talking to her.

Great movie - I'd recommend it.