Very nice tour, but the last 500 meters are borderline. Nevadaweg partially damaged, 30 cm wide, no railings 100 meter steep drop. Only suitable for experienced hikers with a head for heights. It's not safe.
OK, everything is fine, only the last part is nasty. If there are stairs on the left leading down into the valley, you can continue. The tunnel is low, with a railing on the outside, partially floating. Then there is another branch, on the right there are overgrown stairs up. We took that one, I wouldn't have been able to follow the Levada any further, as I have latent problems with heights when it gets that extreme.