If you want to experience Sevilla from the inside in a magical city then please consider staying with Joaquín and Natalia. The place is convenient, clean, quiet and surprisingly big with its multiple levels. Parking is tough in Sevilla so consider taking a train or flying.
Both Joaquín and Natalia are excellent communicators about their space and city. You'll feel at home immediately and if I had known about how great this space is, I would have booked us for longer. Two nights is too short.
Sevilla is magical with excellent food so give yourself more time and stay with Joaquín y Natalia!