Samuel's flat in Triana is beautiful, newly decorated, and very well kept. It was all very clean with very comfortable beds and air conditioning thoughout. It is spread over 3 floors so it feels spacious. There are two lovely terraces, one with a hammock - only thing to bear in mind is that there isn't sun on the terrace in the late afternoon/evenings.
We loved the area, it feels much less touristy than the centre. The only thing to bear in mind is that it is a good 20minute walk to the Cathedral/Alcazar centre.
We didn't meet Samuel but he was very communicative over email and it was easy to check in when we wanted. He also sent some local recommendations. I would recommend staying in this flat.