Enrique received us very well on our arrival, and the appartment was perfect, newly renovated, well equipped and very clean.
Its general location is very good, the Malasaña area is a lively and pleasant area full of shops, bars and restaurants, close to the old center and you can walk to a lot of touristic attractions.
But the appartment is on the first floor with views on a busy street and place with a tavern's terrace. Despite double-glazed windows, on our first morning (eve of a festive day) we were awaken very early by a beer kegs delivery right under our window that lasted three hours ; on the evening the noise of the crowds in the street lasted hours after midnight ; and the following days we discovered that the thin walls also let us hear all the neighbours conversations, tv, and dog's barks. All in all we didn't sleep much. I'd recommend bringing earplugs.