I had the most wonderful stay at Javier's place. It's in an ideal location, walking distance from all the main sights in Seville. It's very close to a Carrefour Express (and less than 10 minutes to a much bigger Aldi) and there is a coffee shop directly across the street (and an even better one 90 seconds round the corner, attached to a hotel!).
The aircon works and is quiet; the place is clean and comfortable; I slept wonderfully on the very comfortable bed, which is in a pitch-black room; and most importantly for me, as I was working remotely, the internet was fast and reliable.