It's not in the centre but the 15 & 16 buses run to the centre every 10 minutes or less - It's 70 cents per ride with a Bonobus card (buy one & charge it up at a tobacconist's "estanco"). It's also opposite the biggest park in Seville. It takes about an hour to walk (quickly) around the perimeter. There's loads of bars, cafes, & restaurants on the same block & nearby. Eating out away from the touristy areas of Seville is really cheap. The Mercadona (supermarket) nearby also does ready-made sandwiches & has a salad bar. I hope this helps! :)