We stayed here for two nights in August 2016 (family of 4, with 2 small children).
The flat was large, airy, spotlessly clean and well equipped (nespresso machine, WiFi, AC in lounge and main bedroom etc). It was also beautifully decorated with lots of nice design touches.....and in a great location (15 min walk to the old centre).
All around the area are bars, cafes, restaurants and 2 supermarkets within a few minutes walk. The main avenue (on which the flat is based) is busy during the day, but the flat is on the 4th floor, and traffic noise was not a problem. Parking on the Main Street is charged, but there is ample free parking in the many streets which come off the avenue - we certainly had no problem finding free parking.
Montse was really helpful (speaking perfect English) and giving tips and tourist advice about Valencia and public transport....and our only complaint was that we couldn't stay longer (we wanted too, but the flat was booked)!
All in all this is highly recommended by us - beautiful flat, great location, helpful owner and a great city (albeit we feel we only scratched the surface in 2 days). We'll be back I suspect....