The place is exactly as described. You'll find (when you follow Sergio's instructions and NOT AirBnB's address) very easily a cosy old village house. Having said this, you shouldn't expect modern interior. It's all perfectly functioning, though, and the shower - while at the first glance ready for refurbishment - provides hot and also sufficient water to have a good shower ... I definitely had worse in 5*Hotels. The shower stands for the rest of the house. You shouldn't book if you love luxury and fancy design. You also shouldn't book if you don't have a car or are a beginner in driving (in case of the latter, you shouldn't actually rent a car on Tenerife at all)
However, the place is ideal for someone looking for a wonderful place to rest, to enjoy the garden, to sit outside in the small yard, and to be happy and well away from the tourist hotspots. You just have to walk 200 m to the shop to get anything you need for daily requirements, and the only bar-restaurant in the village offers the best local food on the island (most expensive dish is a giant pulpo for 10€). This all comes together with friendly villagers.
Communication with Sergio is absolutely easy and timely. The house is actually owned by a wonderful women, who doesn't speak English or German. You might consider to write in your request if you speak Spanish, which will make the process on site even smoother.
And yes, there are cars on the street, but a fraction of what you have on any average city street, and yes, there are dogs in the village (not usually in the streets, though) who occasionally communicate. No need to worry: the house's walls are thick enough that you won't be disturbed in trying to sleep till noon.
We will definitely recommend this place to friends and family ... for us it's the best place to stay on Teneriffa