I stayed at the apartment for a month while there for work and it was perfect for what I needed... An apartment with the amenities needed such as washing machine, wifi, and aircon (rare in Madrid). The apartment is small, but good for one person max I think. Maybe 2 people for a short stay. The road is noisy, but that's okay if you sleep with the doors closed as they block out the noise really well. Overall, the place was good and in a good location for all the bars and restaurants of Malasana and the metro station 1 minute away.