My wife and I just finished a 4 night stay at the apartment in Seville.
We were met on arrival by Carmen, who despite limited English was able to show us the essential things.

The apartment itself is very nice, ultra modern designer style décor with plenty of space. A neat loft bedroom upstairs and another good sofa bed in 2nd room downstairs.
Good quality kitchen with everything you would require if you wanted to self-cater, also great bathroom with lots of space.
Air-conditioning was very handy as it was quite hot like 37c during our stay.
My only issue was the WIFI, it was consistently slow.

The apartment block itself is pretty quiet, being on ground floor we expected some noise from above but no problem. Also its within a secure courtyard with good front security gate. Just outside about 50metres to a nice small park and close to heaps of eating/drinking options.

Seville itself was a bit of a disappointment for us i'm afraid, it was pretty hot (I know weather is just pot luck) so most of afternoon/evening was downtime.
Also our last day was Sunday, and the whole town (except a few bars) was like a ghost town - not complaining as this is a cultural thing, just commenting.
But the most disappointing aspect was the attitude of shop & bar staff - I know its dangerous to make generalizations based on a 4 day stay, but we have never encountered so many rude and snobbish attitudes in one place. Maybe its a Seville attitude thing I don't know, because since then we have travelled on to Madrid and northern spain / basque country, and the people have been super helpful and friendly.

So overall, we didn't rate Seville so well.
But this was no reflection on Rafael's apartment, it's modern, elegant and completely functional.