It is a good place to stay. It is close to supermarkets such as Hipercor, Carrefour Express and Mercadona. It is also close to Corte Ingles. For many people, it is possible to walk to the city center (30-40 mins). The flat is ok, a little bit dark, but it is still okay. Some appliances are a little bit old, I suggest therefore to the owner a renewal.
It is a clean place and I think you can stay with at most one child. There several playgrounds nearby. Internet Cafee too.
Agustin is a very nice and helpful guy.