I stayed 3 week with María José. She Is a very warm and responsive person. She will help you--just ask. She gave me great ides for sightseeing. She even cooked a delicious Spanish tortilla one evening and invited me to share it. And she offered to wash my clothes in her washing machine.
The apartment is small, but cute and cozy. In February-March you do need a portable heater in the room for warmth and to control dampness (Seville tends to be damp.)
The location is good--8 minutes to train station and 10 minutes to historic sites.
I recommend a stay with Maria Jose highly.