Valentina's apartment was a really great place to stay in Seville. It is located in the old town in a very convenient location; there are tapas bars two minutes away, and the nearby Plaza de la Alfalfa is a really cute area. Sights like the Cathedral and the Jewish quarter are about a six minute walk away. (I can't imagine driving in the Old Town, it's not something you should plan on.) The roads are centuries old and as such winding and kind of difficult to navigate by memory, but with Google Maps and international data it was easy to manage.
I never met Valentina in person but I communicated with her during our stay and she was always very quick to respond. She gave us recommendations for nearby restaurants as well. The apartment was cute and spacious, and it has air conditioning, which was a must for us visiting Seville in August. (Apartments in Seville are also designed to keep out the heat, with narrow spaces between buildings.) Overall this is a good place to stay to be within an easy walk of historical sights, tapas, and flamenco bars.