We stayed for 2 nights at Carlos's place on our tour of Andalusia. The apartment is right in the center of the city and everything is walking distance, which was extremely convenient. At the same time, I would warn future visitors that if you plan to arrive by car, it is better to search in advance and find a parking garage nearby to unload luggage etc, because you cannot park on the street there. The Saba parking lot did the job for us.
So to sum up:
On the positive side: Carlos responded fast to all our requests and was a very good host. We never met actually Carlos in person but we had a good communication via phone calls and messages and he also gave us tips on places to eat, on flamenco shows, etc.
The location of the apartment is also a very big plus.
On the negative side: The bed sheets were torn and had a hole (this was a mistake of the cleaning service, not Carlos) and the bed was making noise even at the slightest move. Also, the apartment would need some small repairs, e.g. the towel hanger was half broken, there was also an issue with the toilet flush. These are issues that can be fixed, so if someone does not pay too much attention to such things, the place is fine.