What I can tell you is that if you choose to take this accommodation you will meet the best host ever. I'm saying this because since the beginning they were very responsive, extremely involved to have everything arranged and enjoy our time in Valencia.
The apartment is close to ValenciaCF's stadium and you have a direct metro line from Airoport to Aragon (Line 5) that is at 7 min walk to the apartment.
We traveled with our 2 years old kid and had in the apartment everything we needed for him and in case you need something special you can tell them and they will try to arrange it to you.
Internet connection is very good.
I saw some comments before choosing this accommodation that it is noisy sometimes and what I can say is that we stayed there during Fallas when there are a lot of fireworks, singing on the street and parties till 5 in the morning... and indeed you can hear what is outside but not in a disturbing way at all. Our kid didn't woke up even once in the entire week we stayed there.
I totally recommend it and I will chose it every time I will come back to Valencia