Nice place in a good location! I have been there for about a month. Joana is a really nice host, communication was easy and reliable and she had some good advice for what to do and see around her place and in Valencia in general. You don't have to speak Spanish, but if you want to you'll have a patient and helpful flatmate in Joana helping you to speak and improve.
The apartment is clean and well-equipped with everything you may need. The area around offers plenty of bars, restaurants and clubs to enjoy.
You can get to the city centre easily by public transport or if you like even by walking (20-30 min). If you go for jogging heading towards the other direction you'll be at a beautiful beach in about 10-15 min.