Apartment is located close to the beach (5 minutes walk).
For getting into city center take bus number 19, metro(tram no 6) is also nearby, however I would recommend taking the bus because it will take you directly without changing the bus.
Sergi (host) is very nice guy, provided all necessary information's we asked for, was available all the time. He also waited for us to arrive even though our flight was delayed for few hours (we arrived after midnight).
We had very nice time in his apartment and in Valencia.