Jacobo's wife did our check-in. She didn't speak English and our Spanish is limited to "Hola" and "Gracias", but it wasn't a problem. Instructions for lights, air-con, etc were all easily understood. The apartment is lovely, clean and catered for our every need. Our kids loved the big bath, and we loved the big TV and wi-fi.
The location is probbaly its biggest assest. It's not far from bus stops, metro, or old town. We were surprised to find a large ferris wheel and amusements in the park across the road (turns out this was the annual July fair). The apartment is on the ground floor beside a main road, but we did not find this (or the fair) disruptive to our sleep.
We really enjoyed our time in Valencia and intend to return in the future.