The apartment is very well located, close to the center and to other tourist attractions (and next to the Alamedas de Hercules). Although it has a peculiar shape, with the rooms connected through a narrow corridor with steps, the apartament has everything you need for a few days in Sevilla.
In the summertime, when temperatures outside are extremely high, the cool, cave-like feel of the inside of the apartment is quite refreshing.
You can hear all the noises from the narrow street and from the building's staircase, but the noise stops during th night, so we slept very well. However, it would not be a good "work-from-home" space.
One more thing I want to mention: if you come by car (hopefully a small one!), you can only bring it close to the building to leave your luggage (you can't get in front of the building, there is not enough space for a car to go through).
All in all, we enjoyed the accommodation very much (we gave it 5 stars), but I wanted to point out some details so other guests know what to expect.