Alejandra's place is absolutely gorgeous and incredibly central. It's round the corner from the Cathedral and the Real Alcazar, as well as near loads of bars, restaurants, cafes, and other stuff.
The apartment is very stylish, with lots of nice flourishes, including some ace books and artwork. The rooms are large doubles with en-suite bathrooms. The place is done to a very high standard.
I stayed here with my partner and my parents, and for my parents the central location was absolutely crucial to reduce walking times to central attractions. So it's worth the extra cost if you're looking to stay somewhere very central.
Alejandra is an exceptionally helpful and communicative Airbnb host. Her notes in the apartment were basically a 'How To' guide to Seville, and she answered lots of our daft questions in minutes.
Overall, highly recommended.