The apartment at Casa Quintero was amazing.
The location is perfect as you are 100 m from the giralda and a few steps further from the Alcázar.
The organization to get/return the keys is simple and well done.
We were in contact with someone through WhatsApp which was really responsive (we could leave the luggages a little longer which is really nice because no one wants to leave at noon).
In the apartment itself; it was perfectly clean, all the things we needed was there and they prepared a bottle of water and cokes in fridge (which is exactly what we wanted at noon in July).
Finally, it is right in front of a nice flamenco place which gave a 50% off the price because we were staying there.
In conclusion, this was exactly what we were looking for to spend 2-3 days in the heart of Sevilla.