Google Maps:

https://mapsengine.google.com/map/u/0/edit?mid=zLw-kXaB27BY.khGLxWZvY8ys

Google Street View – It’s an outdated image, but it’s this building:

https://www.google.pt/maps/@32.667321,-16.900903,3a,75y,292.66h,90t/data=!3m4!1e1!3m2!1sIU62pbM4BpWGaxVv4N-E4A!2e0

In terms of getting here, either taxi or the number 19 bus.
You can see the schedule here:

http://www.horariosdofunchal.pt/carreiras/19.pdf

And check the map here:

http://www.horariosdofunchal.pt/index.php?option=com_simip&task=consultaMapa

The stop is Livramento Road Bridge, its the first stop when entering Livramento Road. Then you walk up maybe 200m to the box.
This is the bus stop:

https://www.google.pt/maps/@32.6660505,-16.9015772,3a,75y,352.12h,73.35t/data=!3m4!1e1!3m2!1ssAM-hv5V9w8lNude34fJng!2e0