I stayed 10 days in the appartment and I can say it is well located in the city center.but if you want to get to the beach you have to arm yourself with lot of patience because is a long journey of 30-40 min by bus.
I haven' t met Alejandra face-to-face but she seemed to be a good host. Appearently, because with me wasn t very honest or maybe she is confused sometimes. however i recommend her appartment for anyone who wants to explore the citycenter. Valencia is a nice town but i've seen much beutiful cities in Spain.