Our experience with Maria has been quite complicated at the beginning.
The description from airbnb talked about an entire apartment, showing picture of the all place, living room, kitchen, balconies and so on... It is ( from my point of view) very important to specify that we are talking about a shared accommodation. Only the bedrooms ( and one bathroom) were available for us.
The result was a complete misunderstanding when we arrived in the house, seeing people already there, living there life.
It was a very big deception for me and my friends who wanted a private house in order to celebrate a birthday. We would have selected an other place is the announce in its all had been more accurate. Pictures and description didn't match.
On the other side, Maria has been comprehensive and offered to pay us back the money if it we didn't want to stay there. I have to admit than even if we had to negotiate for it, we managed to have a limited access to the kitchen. She gave us some basic tips and advises in order to help us enjoy the city. The building itself is quiet and in a good neighborhood.
We were 7, split in 2 rooms, not that big, with very limited security locks. I think that for that price, we could have find something better. The stars are regarding our experience there, and not only the flat.
Indeed and to be fair with Maria, the other people in the house looked quite happy regarding their stay.

My only recommendation for you reading me, would be to be sure what you're looking for in order to avoid unnecessary deception/misunderstanding.

By the end, the only conclusion I can give is that one : Seville is an AMAZING city, ridiculously beautiful!!
Don't spend time in the apartment and visit as much as possible!