Silvia is a great, warm hearted person who speaks very good English (and Spanish as well). She was helpful with the recommendations, I had no issues either with her or with the flat. It was very colourful with lots of amenities (shampoos, sun cream, towels, Valencia guides etc.).
As she mentions in the flat offer, she lives with a dog which likes some attention. That wasn't a problem for me but may be for others so you know!
The flat is in the heart of Valencia, walking distance almost everywhere but you have to compromise that with some conversations noise at night (side street with a tapas bar downstairs). For me it wasn't disturbing at all but may be if you're a light sleeper and want to sleep with an open window.
I'd definitely stay at this place again and recommend it to anyone visiting Valencia.