Stay on Sargio's place was great! He was just lovely! We arrived really hungry and he gave us good recommendations of where to go eat or drink or just travel. The location of the apartment is in a very central area but the apartment itself is very very quit ( expat the neighbor that sings in the shower which was funny:] )
I stayed there for only one night but I had a great time there and I absolutely recommend on Sergio's place as a lovely place to spend your days in Madrid(: