Marina's place is a small studio that is suitable for 2 and has all the amenities. It is located next to the old town, city center. There are small shops in the street and a supermarket 10min away. If you want to explore Valencia's sightings this will be a great place for you. But if you are a beach goer, and plan to go to the beach every day, it will take you 30min at least to get to any of these.
Bus stations are near but keep in mind that buses in Valencia are not so frequent and there are no buses after 22h.
Marina is not very good in English, but our communication was alright since I speak Spanish.
Overall it was a very good experience and I would go back to Marina's place anytime.