Very nice and very well located flat. The pictures don't give it justice. Ideal to visit the city by foot. No more than 2 minutes to the cathedral and real palace.
We didn' meet Rosario but her sister, that explained everything and where to park.
The parking is indeed free and included, it is a public underground parking and you use a special pass for it. It is maybe 200 meters from the flat.
Overall a very good experience!