Carlos' place was perfect for my visit to Sevilla. It's relatively small but very comfortable and had everything to make the stay enjoyable. The rooftop terrace is stunning and a great place to hang out and relax after exploring the city. The kitchen area was nicely equipped and stocked with basics; it is serviceable for making breakfast or lunch, but there isn't a lot of counter or storage space. This doesn't matter of couse because you are in Sevilla and there are any number of amazing cafes, tapas bars, and restaurants in the area.
The location is fantastic, easily walkable to Plaza del Triunfo, the Cathedral and Giralda Tower, and many of the city's attractions. Plaza de España and the Parque de María Luisa is about a 20 min walk. The host was very responsive and helpful, and thoughtfully provided a wonderful walking itinerary as well as restaurant recommendations.
Sevilla is an enchanting city and Carlos' apartment was a great place to come back to at the end of the day.