I stayed at Marcos's property for a month working remotely. I would highly recommend for anyone looking for a nice place to stay in Valencia short or longer term for both work or holiday.
It's pretty much as it looks in the photos, well kept and with everything you'd need from a flat. Both Turia Park and La Ciudad de Artes y Ciencias were less than a 5 minute walk away. The old city is only 20 - 30 minutes walk away.