@Ceanna0 Many hosts lament the craziness of not being able to leave star categories of cleanliness & house rules blank. We used to be able to do this but Airbnb changed it so we have to check the stars to proceed...
What I do, is give a 'communication' rating based on whether they explained they couldn't stay in a timely, polite & respectful fashion. Those who fail to turn up & don't bother to tell me, neither before nor after, get a 1* communication from me! - I give 5* for cleanliness & house rules, because their non-arrival means they could not create mess & dirt, nor break rules! (Unless your rules include 'let me know if you decide not to stay'!)
So my written review says either
1) "X had a family emergency/change of plan on day of arrival & was unfortunately unable to stay. I appreciated him phoning/messaging to let me know. He would be welcome to try again!"
or
2) "X booked xx nights at my place one week before check in date. He then never arrived, nor did he offer any explanation, nor respond to any of my messages. I do hope no accident befell him!"