The apartment was clean, the central location is excellent for easily discovering all of Madrid. However the flat is very small and crowded, for 2 people it's okay but I definitely not recommmend it for any more. There's a portable AC in one room with a rather makeshift build-in and a desktop fan in the other, they ran all night because of the heatwave, both make an annoying lot of noise. The hosts arrived more than 30 minutes late to let us in. Also as others wrote before, they do not speak any English, but we managed anyway. Altogether for a night or two, for two people, it's an agreeable deal to explore the city center.