Sky view from Stellarium software vs. Sky view with naked eye
From personal experience - yes your Stellarium picture looks like a good dark sky in the Canary Islands. Certainly, the Milky Way is plainly visible, with lots of detail available to the dark-adapted eye. I more frequently view from the top of La Palma, which suffers a little less light pollution than Teide to the East.

The Canarian sky law was largely setup to protect the night sky quality at the observatory on La Palma, but covers all lighting on Tenerife in a straightline view to La Palma. So I would be guessing that the western side of Teide will be the darkest. 

I found this picture which illustrates the controlled lighting areas (in green). It is not to scale, La Palma is further away from Tenerife (on the right) than illustrated.