We spent almost a week in this apartment and loved it. Other reviewers noted the noise of the city and while there is noise, you are staying in the heart of the tourist district. That being said, the noise isn't bad. There is a theater across the street and you can hear the people when it lets out. Also, the street cleaners might wake you up in the early morning.
But... you are staying steps away from amazing restaurants, cafes, sites and shops. So, if you are a light sleeper who goes to sleep at 8 pm and expects silence, this might not be the place for you. Otherwise, it is a great place! We loved our time in Seville and this apartment was perfect for our family of 4. It was comfortable, amazingly located and delightful!