We met Sandra at the location at the agreed time. She showed us the apartment and was kind enough to let us leave our bags earlier while it was being cleaned. The place was very funky and with an interesting layout, in a gorgeous art-deco building (notice the fantastic wood-carved ceiling in the main hallway).
The kitchen was fully equipped, the sofa bed is large and comfortable, we even got the projector running and watched TV shows from our laptop (even though the colors aren't perfect, it's still a neat feature) and the outside terrace is a great place to have breakfast when the weather is good.
Also the two bicycles came in very handy, we used them every day all around Valencia, and the fact that the apartment is on the ground floor, it makes it easy to carry the bikes in and out.
And of course, it's in the middle of Ruzafa, which I think needs no further introduction.
All and all, we spent 4 great nights in this apartment, and we highly recommend it.