I used this script below and added a WHERE clause for specific users and could see who has access to what reports etc. Worked nicely :)
select <br> C.UserName, D.RoleName, D.Description, E.Path, E.Name <br>
from dbo.PolicyUserRole A <br>
inner join dbo.Policies B on A.PolicyID = B.PolicyID <br>
inner join dbo.Users C on A.UserID = C.UserID <br>
inner join dbo.Roles D on A.RoleID = D.RoleID <br>
inner join dbo.Catalog E on A.PolicyID = E.PolicyID <br>
order by C.UserName
This is the source link - SSRS - Determine report permissions via ReportServer database tables?