While I mentioned the Algarve as an alternate vacation because it is so beautiful, I have read that rip tides, etc are common, so swim only in prescribed areas with life guards.

Yo OP ATFU, some suggested musical listening for your trip:
'Rumba Argelina', the debut Lp by the late great Madrid band 'Radio Tarifa'.
The world-music pride of Madrid and one of our all-time faves, never gets tired.
Hope all goes well!
I am done. the stay-at-home traveler

Just chiming in to say that I would not replace Seville with Madrid. I personally found Madrid to be nice but Seville was beautiful and fascinating, and just much more...unique. Then again, I was there in May, so the summer heat didn't factor into my experience.