Hello @Rebecca676,
You can see reviews of the prospective guest on the request on a laptop and on the app.
If the guest has reviews from previous hosts you'll see information saying how many reviews.
On a laptop you'll see the first review and a link to see others if there are several. If the guest hasn't booked on Airbnb before or if their previous hosts haven't bothered to or haven't yet left a review then there won't be any reviews on the profile.
As you have instant book enabled you'll also see the star ratings given by previous hosts, again only if the person has used Airbnb previously and has been reviewed by previous hosts.
On the Android app click on "Details" in the top right of the request message to see review information. I don't have any Apple devices so can't say how the iOS app works.
Steve.