I spent a month at Carolina's apartment. The location was fantastic -- in the center of the old city, steps away from the Central Market. There were also tons of restaurants and shops within walking distance, including several markets to obtain anything you could not purchase at the Central Market. The apartment is also within walking distance of the Valencia Nord station.
The apartment is as depicted in the photos and spacious enough for two. As others have said, there is a bit of city noise given that it is located so centrally with windows facing the street. But that is to be expected when in the city center, and to me, it was not a negative.
I worked a bit during my stay and was happy to find that the internet connection was fast, stable and strong enough for video conferences.
I would not hesitate to recommend Carolina's apartment for a short or long stay.