The location of Juan's home is terrific, literally 2-3 minutes walk from the historic Cathedral and La Giralda. This is an old and historic part of town, and the ambiance terrific, with horses and cobbled streets, if you like that kind of thing. The downstairs room, where I stayed, is room enough for one. No air-conditioning needed even on warm Seville days. There are monasteries nearby, where friendly nuns will chat with you, and you can buy dulces and jams.
Juan is a very kind host. He explained the rules clearly. A cold Cruzcampo (beer) on arrival helped. There was wine on another day too. The wi-fi is a little spotty, and amenities are adequate and comfortable for a stay (don't expect a resort). You can walk almost to all the major sites, train station, and the long distance bus estacion.