My husband and I had an all too brief visit to Seville, during which we stayed one night at Oscar's mini-loft. Not only was it a fantastic location, but Oscar was incredibly generous with recommendations of what to do during our short stay. He loves his city, and goes out of his way to make you feel at home, making him an ideal host.
We would definitely recommend staying with Oscar-- the sites we saw and food we ate were some of the most memorable of the trip!