I want to give Alvaro's flat score 95/100 !
Location : Perfect, Sol squre/ Atocha Station/ Supermarket are within 10min by foot.
House : Super-clean and comfortable.
But it has little small bed for 2 person. Thus one of us slept on Sofa which is comfortable also.
Host : Very nice ! He welcomed us so friendly and explain all things about house and local restaurant. And he help us to book flamenco by call. Because of him, Madrid was good memory to us. Gracias!