I and my husband stayed one week in Carlos' studio apartment during December 2014. The flat is really well situated: just a few meters from the Plaza Merced but still outside enough to skip the noise from the busy streets of Malaga. Litterally downside the stairs, there is a bakery for nice breakfasts, and in the same street, you can find a supermarket. Carlos was really welcoming; for a small sum, he picked us up at the airport and drove us back (although we had an early flight).
Guests should note that in the south of Spain, the weather is usually so warm that there is no central heating in the flats. It is good to consider if you are coming during the winter, but it is general thought and Carlos' apartment was still an excellent option for accommodation in Malaga.