I've spend three months in this room and have enjoyed every second of it.
This is the biggest of four bedrooms in the apartment (which also has a big living room). The room feels very cozy, especially with the nice decoration on the ceiling, and gets a lot of light from the big windows (facing south) that give you access to your own little balcony. Generally the apartment feels very homey and the shared rooftop is an asset I've used a lot during my stay. The room as well as all shared spaces get cleaned thoroughly whenever one person moves out. In the meantime the people living in the apartment are responsible for keeping the place clean.
I very much liked the Cabanyal district the apartment is located in with it's small colorful houses and narrow streets. To me it seemed like the district is in the midst of gentrification with a lot of new cafés, bars and restaurants for every budget and it generally feels very lively. Supermarkets and all sorts of shops are just around the corner. Walking to the beach takes about 10 minutes and access to the city center via public transport is very good and affordable. Meanwhile, having a car in Cabanyal is probably not very enjoyable as parking is scarce apart from a nearby parking lot that is free but that I wouldn't feel very safe about.
I came to Valencia to work remotely and write my master's thesis away from home. When I moved in I lived with three other Germans, two of them on a student exchange and the third one also writing her thesis. She was later replaced by a Spanish student doing an internship in Valencia. We all got along really well and did a lot of things together in our free time.
During winter months it's advisable to bring warm clothing. While there are small electric heating units provided that are totally sufficient I was still caught off guard a little by how cold one can feel at outside temperatures around 7-10 degrees with the single-glazed windows that are very common in Spain. During the summer months when it's too warm to keep windows closed at night light sleepers might find it difficult to sleep before 0:30 AM as there's two bars and a restaurants with outside seating about 30 meters down the road.
All in all I really cheerished my time in Maria's apartment and will make sure to return if life ever brings me back to Valencia for an extended time!