I stayed at Violeta's flat for a three week research trip to Sevilla. The flat is very central (just off the Plaza de la Encarnacion), easy to find and suitable for one person. It is also clean and the kitchen is reasonably well-equipped (simple cooking is definitely possible). Violeta and her sister (who did the checkin) were very nice and helpful and easy to contact. They even provided some water and fruit when I arrived and offered to do a clean halfway through my stay! Really, my only point of criticism would be that the internet was very unreliable, especially at night and on the weekend - but I think that is a problem of the internet provider.