Joaquin, Carlos and Natalia's place is amazing - the location is very central, on Seville's main shopping street, close to many tourist attractions such as the Cathedral, and many restaurants of varied choice.
The apartment itself is very clean, though the walk up the stairs maybe a challenge sometimes, but the attic room is spacey enough and very clean. The balcony is also very nice to catch a breath.
The hosts are very nice with their attentiveness, and ease of communication. Highly recommended as it was overall a wonderful experience.