Great location. The place is also very nice.
It's by the Cathedral/ Alcazar. You can walk to most places.
The terrace is also a nice touch. Great way to spend the evening by viewing the bell tower and a glass of Rioja.
Maria is very prompt in her responses. She was also kind enough to allow us to keep our bags in the apartment after checkout time.
The apartment is a duplex - you need to access the 2nd bedroom by using a narrow round staircase. This could be an issue with small kids/ senior citizens.
We had a great time. Overall, I would recommend Maria's apartment as a fine place to stay in Sevilla.