My stay at Carlos' place was lovely. The flat is right in the middle of the city, everything that I wanted to see (La Giralda, San Salvador, Alameda) was a 5 minute walk away. I have to say that the photos don't do the place justice, I wasn't expecting how nice the flat was and the view from the window is beautiful :)
Carlos' recommendations of things to see and do were really helpful, especially the places to eat!!! I only stayed one night but I will definitely return :)