We stayed 5 nights and enjoyed Seville (and a day trip to Cordoba by train). Beautiful cities. The architecture and history are fantastic. Narrow streets are great to wander around. Book for the Palace and Cathedral (and the one in Cordoba) on line and get the audio tours. We also saw the bull-ring and Casa de Pilatos. Lots of food options and friendly people. Walking tours are also good value and help to explain the complicated history. Hint: remember to have photo ID for the trains. Booking in advance on line is probably a must and you need to quote your ID number.