My (long term) stay in Valencia, and in this nice loft, was fantastic. I can do nothing but recommend Juan Luis’ place to you. The apartment is situated on a pleasant square in between several great sites of the old center, such as Plaza Ayuntamiento, Mercado Central, Plaza Redonda, Plaza de la Reina, and Plaza de la Virgen. It is close to several bakeries, shops and a lot of restaurants.
The apartment itself is lovely, clean and quite new. It is well equipped with all the things you will or might need during your stay, from coffee machine to laundry machine and from microwave to television.
I encountered no real problems during my stay. Juan Luis is very helpful in providing information and making sure that everything is ok. It is very easy to contact him in case you need anything!

Valencia is a great city to visit and to live in, and staying in the old center or better yet this apartment will definitely make that experience better!