The flat is great, clean and as you can see on the pictures. It is located in a vibrant neighbourhood with plenty to do (bars, restaurant and clubs) and not so as many tourists as you can find in the central Valencia. But the flat is close from the city centre (walking or by bus).
There is a bus taking you to El Saler (a city near Valencia with quieter beaches) or la Malvarossa.
Communication was very easy. We arrived late in the evening but someone was waiting for us (and a bottle of wine in the fridge).
I would recommend the flat.