Our stay in Edu's apartment was great! His parents welcomed us, and gave us a quick tour through the apartment. They don't speak english (and we didnt speak spanish) but that wasnt a problem. We didn't meet Edu in person but he was very helpful through Whatsapp sending us all the info we need, and our questions got answered quickly.
The apartment was spatious and clean and had everything you might need. Do know that you need to go up some stairs (the apartment is on the third floor); keep that in mind if you might have trouble walking; but we kind of liked the 'free workout' ;) The area is pretty close to the city center (10 to 15 minute walk) and the metro is close as well. Also enough options regarding bars & restaurants so you don't have to go far.
Very recommended and would definitely book this apartment again if we revisit Valencia :)