Location, location, location. Everything you want to see in Seville is a 10-20 minute walk from the apartment. Everything you need to buy -- groceries, pastries, tapas, good wine store -- is within 2 blocks.
Maria Luisa was a wonderful host, meeting us on-time, explaining everything in the apartment completely and clearly, providing starter groceries (coffee, milk, cookies, oil, etc), communicating quickly, giving great recommendations.
The only consideration you should have is whether you plan to cook much. The cooktop is small with 2 burners, just big enough for 1 large pot/pan and 1 small one.
Great stay, highly recommended