You could approach the bothy from North, East or South along vague tracks. A nice place to start is from the North, near Diesel&Wyverns cache No8~Elan Mountain Road Series - Elan Valley View. There is a path from just below here skirting around the contours above the bog.
The bothy was restored and opened as a bothy in 2013. Have a look inside at the pictures showing the restoration.
Please be aware the ratings reflect the journey to arrive at GZ also be aware that the bracken is very thick in places and may need cutting back to access the cache.
Placed with kind permission from the Elan Valley Estate and the MBA.