It must be hugely expensive to keep such an old city intact, but I sense the old stuff will still be standing long after the new has perished. Perhaps because there is a tax incentive to restore the old that it gets attention first, but nevertheless, Seville is suffering from too much tourism and too many cars. That and the present day Sevillian is favouring moving out to the suburbs rather than living in the noisy town. The new suburbs are pretty ugly, they lacks trees and the the elegant avenues, but they have parking and that appeals strongly to the modern Spanish. Sleeping in Seville is just as hard as Cadiz or Jerez.
Motor scooters run all night long and cars make a din on paved roads.
The more people shout 'Silenzia' the more strident the phone calls. They also never take their shoes off in the concrete floored rooms above you and always put their TVs on at full blast. You call and she chooses the cards and reads them. If you come for the sun, you'll leave for a rest. If you can, grab a couple of hours ziz in office hours or fall asleep at the wheel of your car.