First of all: it was the best airbnb appartement i ever was. There are some reasons, i wann explain.
Location:
It is absolutely in the center of valencia, you can reach nearly all sight's by walk, nevertheless I recommend a bike. The beach is about 15 bike-minutes away.
The metro-station approx. 7min by walk. It's like a cross, you can go everywhere from this station.
Communication:
Perfect communication. I couldn't say a fixed time, because we were travelling from the north to the south. For jose it was okay, to tell him about 2 hours before estimate arrival. He even send us a message at the second day during our stay, to ask, if everything is fine.
Flat:
The flat was very cleanly and tidy, it seems to be a new appartement. It was very quiet during the nights and perfect furnished as well (a/c). We had everything we need.
And now the biggest plus:
Jose was so kind and put such little daily things like salt, pepper, sugar, oil, coffee dishwasher tabs, washingmachine tabs etc.in the kitchen. We even had beach towels.
Who ever was just a few days in a airbnb-flat knows to appreciate these little things. Because to buy everytime a full pack of dishwasher-tabs,salt, pepper, oil and so on, just to use it once can be so annoying.
One little point, which didn't disturb me, but maybe it's important for someone else. It's a little dark in the flat. Because there is a wall in front of the window. If you like to have it bright, you have to use the light.

I absolutely would recommend this appartement and jose + his wife as well. Such kind hosts, which take care of you.
Thanks a lot for host us jose.
Best wishes,
Konrad