Fernando's place is great. The apartment is located in a secured building with an elevator. It is very conveniently located -- there is a place for coffee and breakfast right at the entrance to the building, there is a market a block away for any supplies, and it has easy access to the city center, Triana, and to the bus terminal if you plan any day trips. There is also a city bus stop about a block away that will take you to the train station.
The apartment was just as it showed in the pictures. It is in good shape and feels authentic to the city. The beds were comfortable, and there was plenty of space for everyone in our group. While the walls are rather thin, noise was never an issue.
Fernando was a great host. He met us for check-in, showed us around the place, and then pointed out some suggested restaurants and other places we should visit in his city. He was also nice enough to provide a few pastries and other amenities at check-in.
We thoroughly enjoyed our time in Sevilla and I can highly recommend this apartment.