Short version: Perfect location, perfect place to stay, perfect host.
Long version: Upon arrival Renato offered to keep our luggage during the day, even though we arrived earlier than we should have. No problems there. His place was sparkling clean and he does his best to keep it that way. The apartment itself is really nice and quite stylish. The bed was amazingly comfy, the room was impeccable and so was the bathroom and the whole place. Renato have prepared a list with nice places to visit (bars, restaurants etc.). There was also Wi-Fi if needed at all at this beautiful place that Valencia is.
The apartment itself is located in just between the old city and Rusafa. This is the perfect location to go everywhere on foot. From his place to the Bioparc, to the Oceanografic museum or the very end of the old city is 30 mins on foot tops, but the walk to every corner of the city is amazing so everyone should definitely do it. Also the metro station that goes directly to the airport is at 3-4 minutes on foot from his place and the airport is only 15-20 min with the metro.
To summarize: The perfect place to stay in if you want to have a great time in Valencia - perfect location, perfect host who will try to make everything easier for his guests, who he treats like friends!