An easy option to get to your apartment from Valencia (Manises) airport is to take the shuttle bus. Aptly called the Aero-bus in Spain, it picks up passengers every twenty minutes from outside of the airport. You’ll get to see a bit of the city and take in the views, as it makes various stops along the way before arriving at El Carmen in the city centre.
It’s cheap too, a one-way ticket will cost you 2.50€.
And if that’s not quick or easy enough, then why not take a taxi. After all, there are times when you want to skip the scenic route. It should take you about twenty minutes and cost around 15€.