A two-sided experience.
Firstly, Leonor is an excellent host. It's easy to access the property (once you've donwloaded the app), Leonor is a very quick communicator and steps in to answer questions or resolve concerns very quickly. The apartment has some wonderful aspects, including the neighbourhood, which is surely the best in Sevilla, an excellent and spacious bathroom, plus plenty of natural light. There's also a lift in the building.
However, I also experienced quite a few issues during my 5 week stay that degraded my overall positive view a little. The internet was very inconsistent, though Leonor worked very hard to resolve this, and at the time of my departure, this was fixed. The apartment living space is in need of a remodel, as some of the cupboard doors catch each other, some scrape against the ceiling, a couple of shelves fell down and several of the doors don't work. It's also, thanks to it's very central location, very noisy at night as it's located on top of one bar, opposite another and sandwiched between yet more. Great for a night out, or a short stay, but not for a sustained period of time.
In conclusion, Sevilla is wonderful, Feria is the best area of the city, the apartment is lovely for a 2-3 night stay, but be aware there are problems, and there's more furniture in the apartment than the pictures, so it's less spacious than you think, but still an ample size.