I spent a month here. You can lock the room with a lock, not built into doors but it does the job! The place is clean, you can sometimes have an unexpected noise from other people in the Airbnb but other than that it's quiet. The Internet is super fast, I work remotely so I needed it. The kitchen is small but enough for cooking—more than enough space to store food or just anything. Regarding the location of the Airbnb, it's just in the heart of Valencia, within walking distance to cover anything you need from the city. The bus that will get you to the beach is 2 meters away from the apartment.
TL:DR: Very nice Airbnb! Thank you