The apartment itself was OK and is located really close to main attractions, like Catedral de Sevilla. Teresa was really responsive and answered my questions quickly.
There are a couple of things to share, I guess, it's not specific for this particular apartment: 1. despite the fact that apartment was located in a private street with no restaurants, I was disturbed by the neighbours who were very loud at 3-4 am in the morning; 2. also soundproofing in the apartment is very poor so you literally can hear how your neighbours are going to the bath or toilet; 3. absence of the direct sun light in the apartment really frustrated as I didn't know when it's the morning. But again, I don't think that any other apartment in this area can offer better options.
Nevertheless, there are a few thing that could be improved: to have a tea pot and probably disposable slippers (the floor is really cold and it wasn't that clean).