Cora is a great host. Excellent communication and very accommodating. The apartment is pretty much as published. Large, which is very welcome, well aired and with all necessary appliances.
It was clean but not spotless. The bedroom area could use a bit of an upgrade, as it is nothing but the low bed and a nightstand and mirror. But in all I'd say in keeping with the price point.
My one issue was noise, as it was terribly loud and went well into the night (Friday and Saturday 3am), from a bar across the street, from people walking around, and in the morning from cars coming up the street (it's a bit of a slope so you hear the reviving). Maybe the sound is amplified in the narrow street. That said, 1) Malasaña IS a busy night area; 2) apparently the level of noise I experienced was above the usual. But since the only windows in the apt open up to the street, and you want them open when it's warm, I would bring earplugs to be on the safe side.
Location is fairly central, near Almagro, Chueca and other attractions. It's the area with CBD stores, lots of bars and restaurants and lots of graffiti -some people describe that as vibrant, others prefer a quieter spot.