We spent 5 nights in Casa Mora. It is ideally located right in Triana just over the bridge. You step out into streets full of tapas restaurants, a market, and the famous ceramics shops. Great location!
The apartment is very clean and nicely decorated. It has everything you need, including a large terrace which is a great place to drink wine and eat cheese in the sun. Feels like you are are right in the street!
The host, Juanma, is very attentive and responsive. He had great tips, and was very welcoming, including making gestures like providing welcoming gifts (eg wine).
There were no real downsides to speak of. Everything is as it appears in the photos. There are staircases between the various levels, so it might not be ideal if that is a challenge for you. Otherwise, it is a great base for discovering Triana and Seville. Everything is within walking distance.