There are several reasons why I suggest this rental.
1. Location. Central and quiet. Those are usually contradictory attributes. But being on a pedestrian-on,y street means no motor bikes or early morning trash trucks to disturb your sleep. If you like,being within walking distance of almost everything, this is a great choice. Being in the old town is great, and lots of activity can be found nearby, so you can easily leave the apartment for a visit to a shop, a quick beer and tapa, or a visit to a museum, and come back for a siesta without having to spend a lot of time getting there and back. We took the airport bus (line EA) and got off at the Torre Oro stop, about a 13 minute walk with roller bags and it was cheap and east (4€). Plaza Nueva (for taxis, bus, and restaurants) is a 3 minute walk away, and the shopping street Sierpes is two streets away.
2. Comfortable sleep. The bed is very comfortable, and is set back from the street so you can close the door (there is a separate air conditioner in the room for comfort). The bedroom window is into a light well.
3. Functional space. The living area has large bright windows with views across to nice historic buildings and the tops of churches. Throw open the windows and enjoy the din of the pedestrians and church bells. The kitchen has the amenities you need for basic food and coffee prep, the bathroom is modern and the shower is great, with good hot water.
4. Good, easy communication. I did not have a GSM phone, but had a portable wireless device to bring with me (very useful for travel, by the way, and only ($10/day, see Tep as an example of one company) so,was able to use WhatsApp for immediate text-like communication to the host who responds immediately. So great for planning arrival time and coordinating the reception, Cris and Jose were so kind and helpful in getting oriented and provided several emails containing suggestions ranging from food, entertainment, culture, and day trips.
5. Cleanliness. Different people have different standards of cleanliness, and I might be on the more critical end of the spectrum, so I am more likely to have found something that didn't meet my standards, but this apartment was as clean as could be.
So I highly recommend this space. Thanks for Cris and Jose! Seville is a great city with lots to offer. Don't rush it, take 4 days or more.