We stayed at this Airbnb when visiting Valencia with our family (two kids, 4 and 6 years old). The location is excellent, in a vibrant neighborhood between the historic center and the Ciudad de las Artes y las Ciencias, which are both within walking distance. Communication with the host was also impeccable - they were very proactive and responded to our inquiries within an hour.
As a minor negative point, the apartment is a bit small for four people (even if two are small children). For example, we had difficulties having breakfast together at the small table. Furthermore, the mattress of the upper bed is very uncomfortable for an adult, as it is rather thin. I would say the apartment is ideal for parties of two.