I would highly recommend Piru's place. It has everything to enjoy your stay in Sevilla. It is very close to the central turist attractions, but at the same time, is very quite. Plenty of places to eat, drink, and enjoy marvelous Cevilla's nights. The appartment is recently renovated, very clean, comfortable, has everything you can think of.
In short, if we will have a chance to visit Sevilla again we will try to rent Piru's place again.