Silvia's apartment is just perfect for exploring Valencia. It's right in the historic center, very bright and perfectly in order. We had a neat bathroom to ourselves. The room in which we slept was quite small but sufficient for a couple of days. It might be a bit crammed if you're travelling heavy. At nights there's some noise from the street; there's a restaurant just underneath the window.
Nevertheless, I absolutely recommend staying at Silvia's place. It's a shame that we didn't get to meet her in person.