Cheap option so you get what you pay for.
Just so that you know what you get: the flat has 3 bedrooms and one bathroom. All the 3 bedrooms are getting rent through airbnb or long term from what I understood. There's only one bathroom that you share with others, no lock on any doors (bedroom or bathroom).
The flat is located on a very busy boulevard. We couldn't let the window open at night because of the noise and it was very hot (here's a mini fan that doesn't really work).
The neighbors woke up us the first night at 11pm to know if the cat belonged to this place and you can hear anything from the flat upstairs.
The area isn't nice but you're only 30min walk from the mushrooms.
If you're looking for the cheapest option in Sevilla and you're juste there for 2 nights, and don't mind the noise that would be ok but otherwise I wouldn't come back even though Merche was nice and welcoming with us