OK, so before I say anything else I will say: don't hesitate to book this flat, this is a proper gem and the best deal you could dream of!
Without any doubt, this is the best place I've ever rented on Airbnb so far. The flat already looks great on the pictures, but it's actually even more beautiful and comfortable. Everything is brand new, perfectly equipped and decorated with great taste and loads of beautiful details and ideas which will make you feel just as (or better than) you were in your own home.
The location couldn't be better, right in the heart of the old town, in the Carmen area, which is full of great bars, restaurants and shops. Everything can be reached on foot and for additional sights (Ciudad de las Artes y las Ciencias, beach, port, etc.) you can rent a bike cheaply from many outlets nearby.
Juan is an extremely polite and kind person who is very precise and quick when it comes to communication. I didn't meet him as he was travelling, I did meet his sister Lola, who was equally nice and reliable. They made everything to make my check in smooth and easy.
I really can't think of anything that can prevent me from saying this is the perfect place to stay in Valencia. Additionally, it is great value for money.
If I'm in Valencia again I will pray that this flat is available! So if you're lucky enough and it is available for your dates, don't hesitate to book it. You won't regret it!