The flat is in a really good location right next to the Mercado Central - it is in the old town which is full of nice restaurants and bars and historic buildings, and it is only a 1/2 minute walk to the bus stop to get to the beach. It is on the 2nd floor of the building (code entry) which has a lift.
It was good having 2 separate bathrooms and a lot of wardrobe space, and it was all spotless. check-in was very quick and easy (we were also able to check in easy which was very helpful) and the flat has everything you need (iron, hairdryer, towels, toiletries, wifi, individual air con units in each room etc). the balcony is small but still nice to have.
I would say always pull the metal shutters outside the windows down when you go out to deter people trying to come in - we had pulled ours up to let light in and did not put it back down when we left the flat, and when we came home from dinner someone had opened the balcony door (it turned out the door lock was faulty so they had been able to open it from the outside - once this is fixed it should not be so much of an issue).
overall it was a great stay and a perfect base for a trip to Valencia.