Daughter with three teenagers wants to spend a few days in Madrid after a house swap vacation in Barcelona. But it's in August! Any hotels have a swimming pool AND a central location? ( I told her it is so hot she should stay in Barcelona and go to the beach, but she has to return to Madrid to fly home, and wants to see a little of the city.

The emperador has a swimming pool and it's located on gran via in madrid. http://www.emperadorhotel.com/

several have pools and AC
Urban, carrera de san jeronimo 34
Wellington,Velazquez 8
in addition to Emperador above.

The others are in Tetuan, Hortaleza,etc but all easily done with the metro (subway).
Tryp Alcala 611
osuna, Luis de Mata 18
Novotel campo de las Naciones
Melia Castilla, Capitan Haya 43
Mindanao, Paseo san francisco de sales,15 (chamberi)
NH Eurobuilding, calle padre damian 23 (chamartin)

its your choice.