We stayed in Sevilla and in this apartment for 3 days and had a great time. The apartment was very clean and organized. When we arrived, Maria, a very nice lady showed us around (she doesn't speak English so if you don't know any Spanish, you might not be able to ask her questions). There's a small supermarket (Dia Market) right outside the door which is great if you need groceries (I noticed they are open in the morning only!). The location is also great it's in the central part of Sevilla near many historic and touristic sights like La Giralda and the Cathedral. Plaza de España and Plaza de Toros are not very far either.
The neighborhood is also very clean and safe even late at night. The only thing you should keep in mind is that the streets are very narrow and a car can barely fit in them. The sidewalks are very tiny though if you are driving or carrying a very large suitcase from the train station, you might find it a bit challenging though to move around freely. Speaking of the metro station, the Sevilla Santa Justa train station is just 15-20 minutes away on foot so it's not very far.
There are two small places near the apartment that I highly recommend: BODEGA which is a bar/restaurant with great tapas and wine selections and PANYPIU where you can have breakfast and they have great pastry. Also, check out Casa de la Guitarra which is a guitar museum and have fllamenco shows pretty much every night and it's 5-6 minutes away from the apartment. I had a great time here and if you are visiting Sevilla, I recommend this apartment.