Mario's apartment is located a couple of blocks away from the train station and a few bus stops from the city centre, which was great for us since we arrived and left by train.
The apartment was nice and clean and had the perfect amount of space for three people, beside it has AC in every room which is great in such a warm city as Seville. Mario was very helpful and gave us some useful touristic information, besides he was flexible regarding check in and check out times.