"What can I expect to see around Seville and Granada?"
You will see amazing Andalucia and you will have much better and warmer weather than in Barcelona during october. If I would be a firstimer to Spain and would have only one week I would go for 3 days to Granada, 3 to Seville and 1 to Cordoba. These places are just amazing, people are very friendly and both, Granada and Seville have an excellent vibe apart from really terrific places to explore like the Alhambra

