It can actually be found not far from my favourite view of Cardiff, at 51 33.A(B-6)C 003 0D.EF(G-5)
where
A = JTM
B = JL
C = TNB
D = JGTH
E = TFC
F = FTT
G = ANB
Cache can be approached from multiple starting points; the cache marker is at a car park which will probably make the easiest/shortest/quickest walk but you could start at the car parks of the Maen Llwyd or even the Ty Mawr if you prefer.
Path is mostly rocky but stable, although it can be muddy. Cache is near a path, bringing your own machete should not be necessary.
Cache is placed with permission as per the agreement with Natural Resources Wales.