Location, location, location..... These guys have all three :-)!!!!
This flat is truly convenient to EVERYTHING! It took me four bus stops from the train to arrive to their place from the central train station. Just take bus C2..... Located in the old city but away from all the crazy noise, I was able to walk to all the historic sites within minutes just south of the place... And then a few minutes in the other direction put me smack dab in the middle of an awesome entertainment called Avenida Hercules.
Both Carlos and Antonio were awesome. They were more than helpful and truly hospitable. The room was comfy and their kitchen was fully equipped. If I were you, I would definitely not pass up staying here.