Jesus and his father are very kind and responsive hosts. They were quick to respond to any questions and small issues. The apartment is a very good choice, especially for shorter stays. The location is great, as Triana has a character of its own and you're still a short walk to the historical center. There are restaurants and supermarkets (and the Triana Market) are all around the corner. The building is renovated and the apartment is clean and well appointed. It faces the interior courtyard and it's very quiet. For longer stays, it's a good choice but keep in mind that kitchen essentials, towels and cleaning supplies are somewhat limited so plan on getting some of those yourself.
If you're planning to park in the area, the lot that's closest to the apartment (as shown in the listing) actually doesn't allow overnight stays. The other one noted in the listing is EUR 19 a night. However, if you're up for an easy 10 minute walk, you can use the APK2 app and park at the Arjona parking garage for under EUR 7 a night which is a good bargain.