As Macarena was out of town, our hosts were her parents. They were really kind and helpful. Elena (mom) was waiting for us at the apartment at the agreed time (+ time of our train latency) and also she gave us very helpful info about how to get to the beach, sightseeing etc. At the same time Juan (dad) was checking via phone if we managed to find the place which was very nice and responsible of him. Also, in the apartment there were several Valencia guides and maps which were handy for us.
The apartment was very tidy and clean. Everything was exactly as on images. Great apartment for 4-6 people. Neighborhood is nice and quiet even though someone in the neighborhood had work in progress (shattering and noise). JSO train station is at 15 min walk. Center is at 10 min walk. CAC is at 15 min by bus. Beach is at 20-25 min by bus. Good location.
Check in and check out time were flexible which was pretty useful for us.

All in all, wonderful time in great apartment. Absolute recommendation.
Big thanks for Juan, Elena and Macarena from all of us! :)
Thank you for making our visit to Valencia better!