Villa Pilar is located in Campo Mijas, a well-established estate on a hill overlooking the coast towards Fuengirola, and the mountains towards Mijas. It is 3 kms from the coast, and about 5 kms from Mijas town centre ("Mijas Pueblo").
It is approx 27 kms from the international airport at Malaga. (Driving instructions are here)
Click on the link below; this will show you a satellite picture of the villa. Satnavs are not totally reliable for getting to Villa Pilar - better to get them to take you to Avenida de Mijas and then follow instructions provided here.
Alternatively print a copy of the Microsoft map and show it to the taxi driver.
Google map of Villa Pilar Microsoft map of Villa Pilar