Fantastic. Location was perfect, right in the heart of the old city close to all the sites, bars, restaurants etc and a 2 minute walk from the central market.
Appartment was clean, well-equipped and very comfortable. The whole place was air conditioned meaning it was nice and cool inside - very important in Valencia during August. Internet was incredibly fast. Communication with the host was great - fast responses and easy checking in and out. Also offered tips and recommendations for things to do/places to eat etc during our stay. All in all we couldn't have asked for any more. Would highly recommend.