I made the mistake of walking back to the hotel through the centre of Madrid, which was hot.Not least I was keen to see the Oratorio de Caballero de Garcia, also designed by Juan de Villanueva, but in a straight and not especially interesting neoclassical style. I only photographed the door locks :-

I passed the Iglesia de Las Calatravas, which is in restauro:-

The big and unexpected treat was wandering in to S. Antonio de los Portugueses – small and early seventeenth century in architectural form, with surprisingly elaborate later frescoes by Luca Giordano and a ceiling by Francisco Rizi and Juan Carreño, all very complete and well preserved, if restored:-