I stayed here for 4 nights, here are my personal experience:
Pros: cheap, the host (her brother) is a nice guy, he tried to accommodate me. I really appreciate that.
Cons: 1- the female host doesn't live here, I actually don't think Luis (her brother) lives here either. He seems to manage a few Airbnb properties that he always said he has to go to another flat, which is fine, I enjoyed to have the whole apartment most of the time.
2- the description is not accurate. The apartment is far away from city center. Luis showed me the bus number 1, it took 30 mins to go to cathedral. When you get to city center, I usually walked around and then I can't find the bus station to come back to the place. The bus route has a loop when it comes back, so it usually takes more than 40 mins to come back from the city center.
3- the room is small, the bed is small. The shower is the smallest I've ever seen. I'm 5'6, almost 125 pounds, not a big girl at all. I could hardly turn around in the shower, very limited space.
Anyway, it's a fine stay, I like the host Luis much better than the place itself. If I'll come back to Seville, I probably will ask Luis out for a beer, but I will not stay here again.
Just my thoughts and hopefully give you all an idea.