The apartment is very good, clean and very spacious (at least for us-two people travelling). Everything worked there. I would definitely stayed in this flat again and recomended it to couples or to the groups of 3 people.
Raúl gave us good tips about where to go and what to do. Thank you, Raúl!
Malasaña is a great neighborhood with beautiful streets, nice koffee shops, good bars, close to all the attractions, but it gets a bit noisy sometimes. So keep that in mind if you prefer a good night sleep:).