The place is right in the centre of Seville, so it is pretty easy to get around and see most of what Seville has to offer without taking public transport.
The apartment is cute, very clean and big enough for two people. The terrace offers a great view of the Giralda Tower.
We didn't get the chance to meet Joaquin in person at all. He gave us all the information we needed to get to his place safely and everything was pretty easy. We didn't have to contact him during our stay.
I would recommend you to stay there.