This is a beautiful apartment, one of the better and coziest I've had the pleasure to stay in since I've been on AirBnB. I booked it because last time in Seville I stayed in the worst hotel of my life and I said to myself "never again".
It's located in the heart of Sevilla meaning that you are within a 15-25 minutes walk from basically everything you want to see and everything you are going to need.
Being so central it also means that the street downstairs is very crowded and noisy, especially during weekends and festivities – and I went for Christmas time, so probably I've seen some of the most crowded evenings of the year.
Noise wasn't a problem for me, but due to the crowded area and being on the fourth floor with no elevator and steep stairs, I wouldn't recommend this place to families with kids or to people with mobility problems.
For everybody else, this is a great, beautiful and cheap place to stay and enjoy Seville!