Roque nublo is a huge rock of 120 mts of height that stands alone in the midlle or a rockbed. This is the purest kind of basalt, hence very hard, but the outside layer can be a bit dirty with debris due to exposure.
Best done in trad but some sport routes (very mental) are spread on its smaller siste "La Rana" just next to Nublo
You need a permit now to climb in Roque Nublo. Its free. Get it at Las Palmas City Hall
From Las Palmas. Take GC-110 (carretera del centro) with the next itinerary Tafira - Santa Brígida - San Mateo, continue on the same road until you get to the split that has de sign with directions Cueva Grande, Pozo de Las Nieves and Roque Nublo. Turn left here following those directions, this is GC-600 follow the same road until you get to Roque Nublo (27.965731 N, 15.601503 O).
This is a very visited path and it's also well marked, there is almost one kilometer from the begining of the path at the main road until de routes.