With a friend we stayed 5 days and 4 night in Alicia's apartment and we loved it! The area very good located (no need to take the metro to visit the city, you can do everything by walk from the apartment). Malasana has a very good atmosphere (nice bars, restaurants, and people really welcoming).
We enjoyed the apartment and we felt like home. We slept very well. The apartement was beautiful and clean. Alicia made sure that we feel good in her home and she prepared everything before we arrived. I definitely recommend her as a host ;)