I stayed with a friend for 4 days in Seville. Carmen was very responsive and helpful, ready to receive us in her apartment on time.
Downsides: The apartment is on the ground floor, right by the building entrance and you can hear everything from people coming in at any hours of day or night. Also, during our stay, there were road works happening everyday (except Sunday) from 8am just outside. I know it's not Carmen's fault, but I can't help but feel it would be nice to have been warned about this issue, because we were not able to rest properly during our stay.