The apartment is well appointed with all you could need, lots of living space, well equipped kitchen and good sized bedrooms.
The location is right in the heart of the old town, so all the attractions are within easy walking distance, as are the train and bus stations - which you are likely to be using as you don't want to make the mistake of driving or trying to park a car in old Cadiz!
The apartment is in an old building and has lots of interesting old features which really add to the experience of being in the historic part of the city. Do be aware though that as the streets of the old town are so narrow noise does travel, so any evening revellers down below will be heard in the apartment. This is only an issue in the front bedroom which has a window facing the street (we used the back bedroom which was pretty much silent). So if you need to use all three bedrooms and are a shallow sleeper you may want to consider bringing some ear plugs - although we were there for carnival, so it was likely to have been louder than a 'normal' week.
Overall a really nice interesting apartment which makes a great base to explore the old town of Cadiz.
There are two small supermarkets within 2 minutes walk which sell the essentials, and it's less than 10 minutes walk to a large supermarket and to the town market where you can find everything else you are likely to need during your stay.