We stayed at Catalina´s for one night (but booked for two). This allowed us to come straight to the apartment from our 6:30am flight. The positive of this place is that it is next to the Cerro de Lucía, and two metro lines. What is also great (but also a drawback) is that there are restaurants in the courtyard where the apartment is. There were a few issues but Catalina was quick to respond.
If you are a light sleeper, please keep in mind that this is next to a club or two. We heard quite a bit of noise throughout the night. Granted, it was a Saturday night, but if you are a light sleeper, this is something to keep in mind. Furthermore, for a heater, she offers two lamp heaters which work quite well. However, one of them is so bright, that it seems like you are sleeping with the lights on. I slept well, but my wife didn´t, so it is something to keep in mind.