I made a quick weekend trip to Seville this past weekend, and Juan made my stay incredible.
Although I did not get to meet Juan--as he was at a conference--he made check in, and my stay quick and easy. When I arrived, he arranged for his wonderful friend Manuela to check me in, and show me how the apartment works, and where to go during my day in Seville.
Juan was also kind enough to book me two tours--one for the museo de flamenco, and one to view the cathedral and the alcazar--which I highly recommend.
The apartment was very clean and open, and Juan responded promptly to any questions or concerns that I had.
Juans abode is also within 20-25 minutes of walking between all major attractions that tourists want to see; which was fantastic!
Overall, an A+ experience, and would recommend to anyone and everyone.