The apartment is excellent and exceeded our expectations. There's everything you could need, from a well equipped kitchen, towels, shower gel, to very good wifi. If you are a coffee fan, the coffee maker is great, with coffee pods provided. It's spotlessly clean, fresh, light and airy. Jose is a perfect host, on hand to sort any problems (a shutter got stuck as I'd opened it too far, Jose fixed it in 5 minutes - thank you Jose). On arrival he spent 30 mins showing us a map of Seville and advising us of the sights to visit, restaurants and bars he recommended, and local supermarkets, which was extremely useful. He handed us much needed chilled bottles of water when we got there :)
The apartment is on the 3rd floor, accessed by stairs only, so would be difficult if you have heavy bags to carry (pack lightly!). It overlooks a fairly busy street, with traffic and a few bars. It does quieten down after midnight. The double bedroom at the back is quieter, away from the noise. The twin room overlooks the street.
The apartment is perfectly situated very close to the sights - 5 minute walk to the bullring, the cathedral and Alcazar. Seville is very easy to walk around and the sights are so close together. There are many good restaurants/tapas bars close by, especially on Calle Adriano, and a bit further away, left of the cathedral on Calle Argote De Molina.
If arriving by bus from the airport it is a 10 mins stroll from the bus stop, at Torre del Oro (Golden Tower) and is easy to find - suggest you use Google Street View to 'walk' it so you find the door to the apartment block, as it's tucked away in the very corner of where Calle Antonia Diaz and Calle Arfe meet, to the right of cafe Los Angeles and opposite El Arenal bar.
Over all we highly recommend this apartment.