An excellent location! We stayed for three nights at the apartment and used it as a base to explore the city. The apartment was simple, clean and well looked after. The apartment was well located for city exploration being in the heart of the historic quarter.
The place was located close to vibrant night life which was a little loud on earlier nights when we had the doors open to keep cool and there was building work next door but this is likely only temporary.
All in all a good place to base yourself from if you are looking to experience Valencia!